Drawing pictures with diffusion-limited aggregation from Kevin Atkinson on Vimeo.
I've wanted to try this idea for a while, so here's a quick-and-dirty version. I'd like to revisit it and do it properly sometime.
The idea is: make a picture using diffusion-limited aggregation. The code and technique I used is the cheesiest of quick hacks, but the results are really encouraging.
The pictures are nice, but most of the fun is watching them develop. So here are some movies of the process, each with slightly different settings: