Oooo very nice! Thinking I'll maybe take my own advice and try Gimp, I do a lot of 3D rendering work as well so always on the lookout for cool ways to make textures.
Photoshop has many cool effects and thousands of plugins for tricks like that...and they do loads of other great/wierd/wonderful things...but all made by people or companies who want and need to make money from it...so they all cost £££...at least with GIMP it's all free (or by voluntary donation).
Gotta love open source apps
