Asset Forge: Game Art Prompt Kit (Sprites, Tiles, Icons, UI)

Stop getting a different art style on every generation. Asset Forge locks your style and changes only the subject, so a whole set of icons, tiles, and characters looks like it belongs in one game. Every prompt tells the model not to draw text, because image models garble lettering. Add your words in-engine with a real font.

What you get

• Prompt library: the style-lock method, 10 style presets (16-bit, 8-bit, HD pixel, isometric, hand-painted, flat vector, cel, low-poly, ink horror, neon), and 18 asset templates (idle, turnaround and side-view characters, portraits, enemies, items, skills, status and currency icons, ground, wall and platform tiles, parallax backgrounds, props, and UI panels, buttons, bars and dialogue frames), with a worked example of each.
• Four prompt dialects for each template: Stable Diffusion 1.5/SDXL (tags + negative prompt), FLUX.1, Midjourney v6/v7 and GPT-Image / DALL-E 3.
• Prompt matrix: all 180 type × style combinations in all 4 dialects, in one CSV.
• asset_forge.py (Python 3, standard library):
  • build and batch for your own prompts.
  • expand, which turns a one-line brief into a structured prompt using a free local LLM or any OpenAI-compatible API.
  • Cleanup tools (need Pillow): keyout (background to transparent), pixelate (snap to a true pixel grid and palette), seamcheck (does this tile repeat cleanly?) and sheet (frames to a sprite sheet).
• AI art and itch.io guide: what the Generative AI disclosure means for your game or asset pack.

Tested results, measured on 2026-10-14

• Prompt builder: 720 prompts built (18 types × 10 styles × 4 model families), 0 template issues.
• Brief expander on Llama 3.2 3B (local, CPU): 80 requests, 100% valid JSON. 0 forbidden terms on a whole-word check; the automated check flagged 1 false positive ("texture"). Median reply 4.0 s.
• Cleanup tools on test images:
  • keyout removed the white background and kept white details inside the sprite.
  • pixelate produced a 32×32 grid.
  • seamcheck passed a tileable texture and flagged a non-tileable one.
  • sheet packed 10 frames.

Honest notes

• The image prompts are untested on image models. They were written for SD 1.5/SDXL, FLUX.1, Midjourney v6/v7 and GPT-Image / DALL-E 3, but we had no image model to test them with. Treat them as a strong starting point and expect to iterate. Results vary by model, version, seed and settings.
• On a small 3B model, expand sometimes shortens your brief (e.g. "weathered wooden dialogue box" → "weathered wooden box"). Check the subject before you generate.
• AI art on itch.io: itch requires a Generative AI disclosure and enforces it on asset pages. If you sell or ship art made with these prompts, tick "Graphics" and say what was generated. Many players filter AI art out. See AI_ART_AND_ITCH.md.
• No AI-generated images are included. This page's art uses real fonts and a hand-placed pixel sprite drawn in code.

License

Use the prompts and tools for any number of your own games and apps. The images you generate are yours to use or sell, subject to your image model's terms. Don't resell the prompts, matrix or tools.

More from AgentForge

• Godot 4 AI NPC Starter Kit: talking NPCs that act on what players say.
• Free AI NPC Sampler (planned URL)