adapted from: http://en.gentoo-wiki.com/wiki/GIMP_Fractal_Backgrounds
Yes I know these are not actually mathematical fractals. But, let’s call them fractal-looking backgrounds.
Here are seven easy steps to make cool fractal looking desktop backgrounds with the gimp!
Create a new image with the gimp with your desired image size. Set ‘Fill with’ to Foreground color.
Click on Filters > Render > Nature > Flame
Adjust Zoom to 3.00, then click Edit.
Change Variation to Spherical. Adjust the Speed here as well if you would like. Then click OK.
No step, just click OK. This may take a few minutes depending on your computer power.
Click on Colors > Colorize…
Adjust the Hue value as desired. Slide it back and forth to find a color you like then hit OK.
You are done! Save the file as a .png and share with your buds and impress chicks with your gimp-fu.