Generative art with CSS

I haven't touched generative art since the boring things they make you do in programming 101 courses, but this is truly cool--all the more so when you realize what the animations must look like. Not your father's CSS! I wonder what might be satisfying to do as an intro level experiment in this sort of thing, just as a toy to host on my website.

Can you imagine what hamster dance ought to look like with a modern stack?