Verified against Nano Banana / Gemini 3.1 Flash Image · 2026-07-21
Turn a hex palette into a brand mood-board flat-lay with Nano Banana
A composited overhead flat-lay brief that locks every object and surface in the frame to an exact hex palette — the natural next step after generating a palette with the Colour Palette Generator, built for Nano Banana's literal reading of pasted color codes.
The prompt
Ready to copy — highlighted parts are example details you can swap.
Act as an art director composing a brand mood-board flat-lay for a pitch deck. Render one overhead photograph — every physical object and surface in the frame must be color-matched to the palette given below, with no object outside that palette. OBJECTS Arrange these real-world objects in the frame: a swatch of raw linen fabric, a small ceramic bowl, a sprig of dried eucalyptus, a stack of blank business cards, a slim fountain pen. SURFACE The objects sit on a lightly textured plaster-grey tabletop. The surface itself counts as part of the palette constraint below — it is not a neutral backdrop you can ignore. COLOR PALETTE (hard constraint) Every object and the surface must be recolored, re-selected, or re-styled to fall within this exact set: #2E4034 (deep forest green), #C9A66B (warm brass), #F5F0E6 (warm off-white), #7A8B99 (dusty slate blue). If an object as described wouldn't naturally exist in one of these colors, substitute a real material or finish that would — for instance, render fabric dyed to the closest listed hex rather than leaving it in its default color. Do not introduce a color that isn't in this list anywhere in the frame, including in shadows, reflections, or out-of-focus background elements. LIGHTING soft, even natural window light from one side, with gentle but not harsh shadows. Since color accuracy is the entire point of this image, keep the lighting even and diffuse enough that no single object is thrown into a color-shifting cast shadow that would make it read as a different hex than intended — a directional light is fine, but avoid colored gels or strong warm/cool mixed lighting that would distort how the palette reads. CAMERA Shoot from directly overhead, camera parallel to the surface, so there's no perspective distortion of the object arrangement — this is a flat-lay, not an angled tabletop shot. COMPOSITION loosely gridded with generous negative space, editorial flat-lay style, nothing touching the frame edge. Leave clean negative space around the arrangement so the image can be cropped into a deck slide without losing any object at the edges. WHAT TO KEEP OUT OF FRAME No text, no logos, no brand wordmarks, no visible hands or tools used to arrange the objects, no color anywhere in the frame — including the surface edges or any visible background beyond the surface — that falls outside the palette above. OUTPUT One overhead flat-lay image, color-graded so the dominant read of each object is unmistakably one of the listed hex values, suitable for dropping directly into a brand-strategy pitch deck.
Customize
Optional — swap in your own details for the highlighted parts above.
Why this works
Nano Banana processes a prompt as one dense block of prose rather than a weighted set of tags the way Midjourney treats comma-separated keywords, which means a hex code pasted directly into that prose is read as a literal, specific instruction rather than one keyword competing for attention against a dozen others — this is why pasting exact codes, rather than only color-name adjectives like "forest green," gives measurably tighter color matching in testing, since "forest green" alone leaves the model free to pick any point in a wide range while #2E4034 pins it to one. Second, naming the surface itself as part of the constrained palette closes a specific and common failure: models composing a flat-lay will often treat the tabletop as a neutral backdrop exempt from color rules stated for "the objects," so an otherwise perfectly on-palette arrangement gets undercut by a background that reads as an unrelated fifth color the brief never approved — stating explicitly that the surface counts is what stops that leak. Third, the lighting constraint is there because color accuracy and lighting choice are not independent in this specific image: a warm tungsten-style key light or a mixed color-temperature setup will visibly shift how a rendered hex reads on camera, the same way it would on a real photoshoot, so a mood-board brief whose entire purpose is palette fidelity has to constrain lighting evenness or it undermines its own hard color constraint by introducing a color cast the brief never asked for. This is built as the direct next step after the Colour Palette Generator specifically because that tool's output is already in the pasteable hex format this prompt is designed to consume — running the two back to back turns an abstract palette into a concrete, presentable pitch-deck asset in two steps instead of requiring the brand strategist to manually translate hex codes into material and color-name language themselves.
What you get back
An overhead flat-lay image with the requested objects graded toward — not laser-precise to — the specified hex codes; treat it as directional mood-board material for a pitch or brand deck, not a pixel-accurate color proof, and expect one follow-up edit ("make the fabric closer to the brass tone") to land the trickiest object.
Verified against
Nano Banana / Gemini 3.1 Flash Image Gemini 3.1 Flash Image · 2026-07-21
Changelog
- 2026-07-21 — Rewritten with an explicit surface-palette constraint and lighting-evenness rule; verified against Nano Banana (Gemini 3.1 Flash Image).
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