I think this is the one I was looking for: https://www.reddit.com/r/proceduralgeneration/comments/i17hn6/drawing_randomly_g...
Here is a couple more, they are pretty different from your example, but still related:
- https://codepen.io/daniellc-the-lessful/project/editor/DPEPmg
- https://www.mysticsymbolic.art/
Unfortunately, the first two don't have any export capabilities.