Take a look at the fractal art of Jock Cooper — there are some amazing images there! And tons of them. Here are a couple more or less randomly chosen examples:
And there are hundreds more! He has also made several fractal animations which are very cool (and kind of trippy).
Of course, I’ve written about fractals before. Most of Jock’s images were probably made using a combination of iterated functions of various types (some using complex numbers) and various computer-assisted manipulations.
Thanks to Sam Lawrence for the link. If you ever come across cool math-related things on the web, or have an idea of something you’d like to see me write about, just drop me an e-mail!