I’ve been playing around some more with the L-system code and modified it to animate the angle property and output each frame to a file. I also added some color and started using blending modes for the brushes. Once I clean up the code, I’ll post it to GitHub.
Anyway, here are some of the animation tests (I used Blender to put the frames together into an animation):
And the first one I did, which is a little too long and a little too fast: