NOTICE: This has not been working in the last few versions of GIMP I tried it with. I'm not sure what's changed or why, but I'll leave this up here in case anyone else wants to try to figure out to make it work, and leave me a comment explaining what to do. I no longer use GIMP (I was given Photoshop as a gift) to explore it further myself.
Links:Brush Manager Plug-inGIMP-Python install package
(Thank you, thank you, thank you for this package!)Background
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You may download, display, upload, share, redistribute, and otherwise use the heck out of this tutorial, but please do not alter it in any way, remove my copyright signature, or claim it as your own. I would greatly appreciate a link back here if you do share it on another website, but it is not required. (Hey, you never know, I may link you back!)
has pointed out a plug-in which expands the Brush Manager to include palettes, patterns, gradients, and scripts. The readme included with this plug-in, GURM (Gimp Unified Resource Manager) is fairly clear, so an additional tutorial by me is not really necessary. You can find GURM here [link]
(edit Aug 14, 2009: fixed link) . Thanks again, ~PhotoComix
for pointing this out to me!