I don't actually use Gimp, as I'm a PS user. I tried it once and didn't get on very well with it. But I often spend an hour or two using StumbleUpon set to photography related web content. It turns some really cracking stuff and some amazing images. Everyone should try it!
Just Google StumbleUpon, download the toolbar and add and configure your preferences.
I tried to add a link but it always comes up to my homepage.![]()