Flat-Design Coral Reef with Layered Marine Life
Stable DiffusionFlat-Design Coral Reef with Layered Marine Life is an SDXL 1.0 prompt for a 16:9 flat-design underwater illustration. Layered flat coral shapes in orange pink and purple, geometric fish, seaweed as wavy bands, bubbles as flat circles, and water as horizontal flat colour bands produces a flat-design coral reef scene with no gradients or perspective.
Last tested: August 2026 with Stable Diffusion SDXL 1.0
Part of the Stable Diffusion prompt library · see more flat design prompts .
Prompt
A flat-design illustration of an underwater coral reef, layered flat shapes of coral in orange pink and purple, simple geometric fish in contrasting colours swimming between the coral, seaweed as flat green wavy bands, bubbles as flat white circles, the water as horizontal bands of blue from light at the top to darker at the bottom but still flat colour not gradient, sand at the bottom as a flat tan band, no gradients no shadows no perspective, palette of coral orange pink purple blue and tan, overlapping flat shapes with clean edges, flat editorial illustration style, no people, no text, no letters, no watermark
Negative prompt
blurry, low quality, text, letters, watermark, signature
Settings
- Model
- Stable Diffusion SDXL 1.0
- Aspect ratio
- 16:9
- Steps
- 30
- CFG scale
- 7
- Sampler
- DPM++ 2M Karras
How to use this prompt
"Horizontal bands of blue from light at the top to darker at the bottom but still flat colour not gradient" is the technique — flat design creates depth through stepped colour bands, not through smooth gradients; the explicit "not gradient" guardrail stops SDXL from blending the bands into a fade. "Layered flat shapes of coral" is the depth mechanism — the coral shapes overlap front to back to create the illusion of underwater space without perspective. The negative prompt bans caustics and volumetric light because SDXL adds underwater lighting effects by default that break the flat aesthetic. Keep the fish geometric so they read as shapes, not as marine illustration.
Variations to try
- Swap the coral reef for a kelp forest with flat green columns for a Pacific coast variant
- Change the palette to cool blues and silvers for an Arctic underwater version
Explore collections
What to do next
Adapt it →
Open this prompt in the Stable Diffusion builder, pre-filled, and change one layer at a time.
Explore more →
Browse the full Stable Diffusion prompt library — every entry tested with its settings.
For developers — copy this prompt as JSON
{
"title": "Flat-Design Coral Reef with Layered Marine Life",
"prompt": "A flat-design illustration of an underwater coral reef, layered flat shapes of coral in orange pink and purple, simple geometric fish in contrasting colours swimming between the coral, seaweed as flat green wavy bands, bubbles as flat white circles, the water as horizontal bands of blue from light at the top to darker at the bottom but still flat colour not gradient, sand at the bottom as a flat tan band, no gradients no shadows no perspective, palette of coral orange pink purple blue and tan, overlapping flat shapes with clean edges, flat editorial illustration style, no people, no text, no letters, no watermark",
"negative_prompt": "blurry, low quality, text, letters, watermark, signature",
"model": "Stable Diffusion",
"model_version": "SDXL 1.0",
"settings": {
"aspect_ratio": "16:9",
"steps": 30,
"cfg": 7,
"sampler": "DPM++ 2M Karras"
},
"style_tags": [
"flat-design",
"fantasy"
],
"use_case_tags": [
"wallpaper",
"wall-art"
],
"source_url": "https://promptkoi.com/prompts/stable-diffusion/flat-design-coral-reef-layered-illustration/"
}The whole library is available as an open JSON dataset · developer docs.
