A bold flat colour poster prompt for ChatGPT
Updated November 2026

What this style is
A flat colour illustration built from a few huge shapes in saturated inks, printed as a poster with perfect hard edges and tiny cut out details in cream. It looks like a designer cut the shapes by hand and sent them to a good screen printer.
What makes it look like this
- objects cropped by the edges at diagonals
- tiny scale patterns cut into the hero shapes
- dots and bowls as punctuation
- type overlapping the artwork
- ground colour reused for small info text
Colours
#0E8A5A#FF1B1B#FFE800#F0359A#F7B4D0#1B4FC4
One saturated ground, one dominant hero colour and one loud type colour, plus small pink and blue accents. For a brand, set the ground to their main colour and make the hero and type the two most contrasting colours available.
The prompt
Paste this into ChatGPT with image creation on. Change the subject and the three lines of words for your own, and check the spelling before you send it.
Create a finished graphic design: a poster in A3 portrait (1:1.41) format. It is for: Late night noodle shop opening in Malmö.
It must look designed and made by hand by a skilled human designer and illustrator, in the style described below. Treat the style as a strict art direction.
STYLE: Bold Flat Colour
A vector illustration built from a few huge flat shapes in saturated inks, printed as a poster with perfect hard edges and tiny cut out details in cream. It looks like a designer drew it in a vector tool and sent it to a good printer.
Signature moves to keep:
- objects cropped by the edges at diagonals
- tiny scale patterns cut into the hero shapes
- dots and bowls as punctuation
- type overlapping the artwork
- ground colour reused for small info text
SUBJECT
Show Late night noodle shop opening in Malmö in this style. Make the subject the hero and fit everything to it: props, setting and details should belong to this subject, not to the example the style came from.
COMPOSITION
Two or three oversized objects tilt diagonally across the page and run off the edges, leaving the type to sit across them in a stack. A few small round or bowl shapes scatter in the gaps. The bottom corner stays quiet for small info in a darker tint of the ground.
TYPOGRAPHY
Extra heavy blocky sans or grotesk in a single bright colour, stacked in two to three tight lines and allowed to overlap the illustration. Small info text in a darker tint of the background.
Render exactly these words, spelled exactly as written, and no other text anywhere:
- headline: "Slurp Season"
- second line: "Hand pulled noodles until 2 am"
- small details: "Open Thu to Sun, Möllevången 12"
Give them a clear hierarchy: the headline large and dominant, the rest much smaller.
COLOUR
Palette: #0E8A5A, #FF1B1B, #FFE800, #F0359A, #F7B4D0, #1B4FC4. One saturated ground, one dominant hero colour and one loud type colour, plus small pink and blue accents. For a brand, set the ground to their main colour and make the hero and type the two most contrasting colours available.
TEXTURE AND FINISH
Perfectly flat colour with a barely visible paper grain, no gradients, no shadows.
AVOID
- gradients
- drop shadows
- stock icon style
- 3D sheen
- gibberish text
- thin timid type
- anything that looks AI generated: plastic sheen, airbrushed skin, overly smooth gradients, glow and lens flare, HDR, stock photo smiles
- gibberish letters, made up words or any text other than the exact words given
- watermarks, signatures, UI elements, borders or frames around the design
- filler decoration: sparkles, floating dots and stars, confetti, random geometric shapes, gradient orbs, ornamental dividers
- uniform line weight, plastic or airbrushed shading, soft storybook gloss, perfect symmetry, melted or merging details, impossible objects
- showing the design as a mockup (a poster on a wall, a phone, a hand holding it): the artwork itself must fill the whole canvas edge to edge, flat and straight on
Do not search the web or look anything up: work only from this brief, so nothing from elsewhere leaks into the design.
Make the image now, in A3 portrait (1:1.41) format, without asking questions first.
(Brief written with OpenTempl, the free, open source design app at opentempl.org. The designer brings the picture back there to set and edit the words.)How to use it
- Open ChatGPT and check that image creation is available on your account.
- Paste the prompt. Replace the subject line and the words in quotes.
- Send it. If something is off, ask for one change at a time.
- Check every word on the poster. A typo in your prompt is copied into the picture.
Three versions for common jobs
The same prompt, set for a gig poster, an Instagram post and a menu. The words are examples; replace them.
Gig poster
Create a finished graphic design: a poster in A3 portrait (1:1.41) format. It is for: a live music night with three bands at a small venue.
It must look designed and made by hand by a skilled human designer and illustrator, in the style described below. Treat the style as a strict art direction.
STYLE: Bold Flat Colour
A vector illustration built from a few huge flat shapes in saturated inks, printed as a poster with perfect hard edges and tiny cut out details in cream. It looks like a designer drew it in a vector tool and sent it to a good printer.
Signature moves to keep:
- objects cropped by the edges at diagonals
- tiny scale patterns cut into the hero shapes
- dots and bowls as punctuation
- type overlapping the artwork
- ground colour reused for small info text
SUBJECT
Show a live music night with three bands at a small venue in this style. Make the subject the hero and fit everything to it: props, setting and details should belong to this subject, not to the example the style came from.
COMPOSITION
Two or three oversized objects tilt diagonally across the page and run off the edges, leaving the type to sit across them in a stack. A few small round or bowl shapes scatter in the gaps. The bottom corner stays quiet for small info in a darker tint of the ground.
TYPOGRAPHY
Extra heavy blocky sans or grotesk in a single bright colour, stacked in two to three tight lines and allowed to overlap the illustration. Small info text in a darker tint of the background.
Render exactly these words, spelled exactly as written, and no other text anywhere:
- headline: "Three Bands, One Night"
- second line: "Doors 20:00, entry 100 kr"
- small details: "Fri 14 Nov, Kolingsborg, Stockholm"
Give them a clear hierarchy: the headline large and dominant, the rest much smaller.
COLOUR
Palette: #0E8A5A, #FF1B1B, #FFE800, #F0359A, #F7B4D0, #1B4FC4. One saturated ground, one dominant hero colour and one loud type colour, plus small pink and blue accents. For a brand, set the ground to their main colour and make the hero and type the two most contrasting colours available.
TEXTURE AND FINISH
Perfectly flat colour with a barely visible paper grain, no gradients, no shadows.
AVOID
- gradients
- drop shadows
- stock icon style
- 3D sheen
- gibberish text
- thin timid type
- anything that looks AI generated: plastic sheen, airbrushed skin, overly smooth gradients, glow and lens flare, HDR, stock photo smiles
- gibberish letters, made up words or any text other than the exact words given
- watermarks, signatures, UI elements, borders or frames around the design
- filler decoration: sparkles, floating dots and stars, confetti, random geometric shapes, gradient orbs, ornamental dividers
- uniform line weight, plastic or airbrushed shading, soft storybook gloss, perfect symmetry, melted or merging details, impossible objects
- showing the design as a mockup (a poster on a wall, a phone, a hand holding it): the artwork itself must fill the whole canvas edge to edge, flat and straight on
Do not search the web or look anything up: work only from this brief, so nothing from elsewhere leaks into the design.
Make the image now, in A3 portrait (1:1.41) format, without asking questions first.
(Brief written with OpenTempl, the free, open source design app at opentempl.org. The designer brings the picture back there to set and edit the words.)Instagram post
Create a finished graphic design: a instagram post in 4:5 portrait format. It is for: an announcement post for a new product launch from a small shop.
It must look designed and made by hand by a skilled human designer and illustrator, in the style described below. Treat the style as a strict art direction.
STYLE: Bold Flat Colour
A vector illustration built from a few huge flat shapes in saturated inks, printed as a poster with perfect hard edges and tiny cut out details in cream. It looks like a designer drew it in a vector tool and sent it to a good printer.
Signature moves to keep:
- objects cropped by the edges at diagonals
- tiny scale patterns cut into the hero shapes
- dots and bowls as punctuation
- type overlapping the artwork
- ground colour reused for small info text
SUBJECT
Show an announcement post for a new product launch from a small shop in this style. Make the subject the hero and fit everything to it: props, setting and details should belong to this subject, not to the example the style came from.
COMPOSITION
Two or three oversized objects tilt diagonally across the page and run off the edges, leaving the type to sit across them in a stack. A few small round or bowl shapes scatter in the gaps. The bottom corner stays quiet for small info in a darker tint of the ground.
TYPOGRAPHY
Extra heavy blocky sans or grotesk in a single bright colour, stacked in two to three tight lines and allowed to overlap the illustration. Small info text in a darker tint of the background.
Render exactly these words, spelled exactly as written, and no other text anywhere:
- headline: "Now In Store"
- second line: "The autumn collection is here"
- small details: "Open daily 10 to 18"
Give them a clear hierarchy: the headline large and dominant, the rest much smaller.
COLOUR
Palette: #0E8A5A, #FF1B1B, #FFE800, #F0359A, #F7B4D0, #1B4FC4. One saturated ground, one dominant hero colour and one loud type colour, plus small pink and blue accents. For a brand, set the ground to their main colour and make the hero and type the two most contrasting colours available.
TEXTURE AND FINISH
Perfectly flat colour with a barely visible paper grain, no gradients, no shadows.
AVOID
- gradients
- drop shadows
- stock icon style
- 3D sheen
- gibberish text
- thin timid type
- anything that looks AI generated: plastic sheen, airbrushed skin, overly smooth gradients, glow and lens flare, HDR, stock photo smiles
- gibberish letters, made up words or any text other than the exact words given
- watermarks, signatures, UI elements, borders or frames around the design
- filler decoration: sparkles, floating dots and stars, confetti, random geometric shapes, gradient orbs, ornamental dividers
- uniform line weight, plastic or airbrushed shading, soft storybook gloss, perfect symmetry, melted or merging details, impossible objects
- showing the design as a mockup (a poster on a wall, a phone, a hand holding it): the artwork itself must fill the whole canvas edge to edge, flat and straight on
Do not search the web or look anything up: work only from this brief, so nothing from elsewhere leaks into the design.
Make the image now, in 4:5 portrait format, without asking questions first.
(Brief written with OpenTempl, the free, open source design app at opentempl.org. The designer brings the picture back there to set and edit the words.)Menu
Create a finished graphic design: a poster in A3 portrait (1:1.41) format. It is for: a one page menu for a neighbourhood cafe.
It must look designed and made by hand by a skilled human designer and illustrator, in the style described below. Treat the style as a strict art direction.
STYLE: Bold Flat Colour
A vector illustration built from a few huge flat shapes in saturated inks, printed as a poster with perfect hard edges and tiny cut out details in cream. It looks like a designer drew it in a vector tool and sent it to a good printer.
Signature moves to keep:
- objects cropped by the edges at diagonals
- tiny scale patterns cut into the hero shapes
- dots and bowls as punctuation
- type overlapping the artwork
- ground colour reused for small info text
SUBJECT
Show a one page menu for a neighbourhood cafe in this style. Make the subject the hero and fit everything to it: props, setting and details should belong to this subject, not to the example the style came from.
COMPOSITION
Two or three oversized objects tilt diagonally across the page and run off the edges, leaving the type to sit across them in a stack. A few small round or bowl shapes scatter in the gaps. The bottom corner stays quiet for small info in a darker tint of the ground.
TYPOGRAPHY
Extra heavy blocky sans or grotesk in a single bright colour, stacked in two to three tight lines and allowed to overlap the illustration. Small info text in a darker tint of the background.
Render exactly these words, spelled exactly as written, and no other text anywhere:
- headline: "Cafe Menu"
- second line: "Coffee, pastries and lunch"
- small details: "Filter coffee 35 kr, Cinnamon bun 40 kr, Soup of the day 120 kr"
Give them a clear hierarchy: the headline large and dominant, the rest much smaller.
COLOUR
Palette: #0E8A5A, #FF1B1B, #FFE800, #F0359A, #F7B4D0, #1B4FC4. One saturated ground, one dominant hero colour and one loud type colour, plus small pink and blue accents. For a brand, set the ground to their main colour and make the hero and type the two most contrasting colours available.
TEXTURE AND FINISH
Perfectly flat colour with a barely visible paper grain, no gradients, no shadows.
AVOID
- gradients
- drop shadows
- stock icon style
- 3D sheen
- gibberish text
- thin timid type
- anything that looks AI generated: plastic sheen, airbrushed skin, overly smooth gradients, glow and lens flare, HDR, stock photo smiles
- gibberish letters, made up words or any text other than the exact words given
- watermarks, signatures, UI elements, borders or frames around the design
- filler decoration: sparkles, floating dots and stars, confetti, random geometric shapes, gradient orbs, ornamental dividers
- uniform line weight, plastic or airbrushed shading, soft storybook gloss, perfect symmetry, melted or merging details, impossible objects
- showing the design as a mockup (a poster on a wall, a phone, a hand holding it): the artwork itself must fill the whole canvas edge to edge, flat and straight on
Do not search the web or look anything up: work only from this brief, so nothing from elsewhere leaks into the design.
Make the image now, in A3 portrait (1:1.41) format, without asking questions first.
(Brief written with OpenTempl, the free, open source design app at opentempl.org. The designer brings the picture back there to set and edit the words.)Layout, type and finish
Layout. Two or three oversized objects tilt diagonally across the page and run off the edges, leaving the type to sit across them in a stack. A few small round or bowl shapes scatter in the gaps. The bottom corner stays quiet for small info in a darker tint of the ground.
Type. Extra heavy blocky sans or grotesk in a single bright colour, stacked in two to three tight lines and allowed to overlap the illustration. Small info text in a darker tint of the background.
Finish. Perfectly flat colour with a barely visible paper grain, no gradients, no shadows.
What to keep out
- gradients
- drop shadows
- stock icon style
- 3D sheen
- gibberish text
- thin timid type
Make your own in OpenTempl, free
Bring your own OpenAI key and the Generate tab uses this exact art direction, called a Look. It can leave room for your words, so you set them as live text and fix a typo without making the picture again. OpenTempl is free and works offline. OpenAI bills you for the images you make, and OpenTempl takes nothing.
More styles
- Halftone Duotone: A photographed face or animal in two clashing inks, giant type biting into it.
- Grain Shape Animals: Blocky animals built from clean shapes, sprayed with soft grain on warm yellow.
- Riso Market Scene: Overlapping ink people carry baskets through a market in pink, yellow and teal.
- Seoul and Tokyo templates in the editor
- All 31 prompt styles
Questions
Can ChatGPT make a real a bold flat colour print?
It makes an image that imitates the look. For a physical version, use the image as artwork and take a print file to a printer that can reproduce the medium: a flat colour illustration built from a few huge shapes in saturated inks, printed as a poster with perfect hard edges and tiny cut out details in cream.
What size should I ask for?
This style is set up for poster (A3 portrait), Instagram post (4:5), story (9:16), square post, flyer (A5). Name the format in the prompt, as the examples do, and the layout follows it.
Why do the words come out wrong?
Image models draw letters as pictures, and they sometimes get them wrong. Keep the words short, put them in quotes, and check every letter. In OpenTempl you can leave room for the words and add them as live text.