Hi,
My website, CubicDesign.com is solely based on The GIMP (for Windows). I have several tutorials on various effects you can do.
I haven't been getting around to making any more tutorials (mainly cuz my interest isn't as strong as it used to be)...
Bye!
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Gautam N. Lad
http://www.cubicdesign.com
http://www.cubicdesign.com/mustang/