OP here. It took me an afternoon to try different methods and test the limits. But now we know how it works it’s very fast to create new ones:

1. Prompt to make SVG - review in browser, iterate.

2. Prompt to write image prompt - review in editor, refine

3. Send to Gemini, get image

So maybe 5-10 mins.

I don’t know how to use Blender.

Also this method can be done over WhatsApp/telegram which is another plus over Blender type approach.