[dsrtslnd23]

which LLM would be capable of this?

[threeducks]

The free Flux.1 Dev model with this LoRA can do it. https://civitai.com/models/794953/coloring-book-flux

Here are a few cats (not cherry picked, no postprocessing): https://files.catbox.moe/5zpp78.png

Some images are not quite perfect, but if you generate enough, there will probably be a good one among them.

[xnx]

Gemini is capable of this: https://gemini.google.com/share/4b1acd0935e3

[kentrf]

ChatGPT will happily generate coloring pages.