Sounds challenging, in a good way.
As for tutorials you may look to the TWC, or the internet. i think the best method of learning with GIMP is by simply using it and trying different things.
http://www.twcenter.net/forums/forumdisplay.php?f=949
some are photoshop, some are GIMP, some of the artists there have epic skills, I just set this up as a solution for orgahs.
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