Apophysis
http://www.apophysis.org/ - “Freeware fractal flame editor for Windows”
This is fun. here are a few I made:
Takes about 10 minutes (on my 1.8GHz dual-core) to render each of these at a res of 1680×1050 at 1000 quality, but w/e, they make cool wallpapers 
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Oh, I love fractals. Never bothered to learn how/formulas.
Time for a new wallpaper. C:
They look pretty.
Beautiful. What options in Apophysis need to be tweaked to make such nice fractals?