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The beginings of a gallery. This is some sample artwork done in GIMP. Also, be sure to check out the Gimp.org Monthly Image Creation Contest

That wacky Linux Penguin by Larry Ewing
Perhaps the most widespread example of GIMP art, the Linux Penguin by Larry Ewing. See Larry's Penguin page for more details on how it was drawn.

Some weird imag by Sven Riedel
An interesting image from Sven Riedels Heterogonie Gallery .

a fractal fish by Tuomas Kuosmanen
A very cool fish generated with the ifs compose plugin. Just a sample of some of the nice work from Tuomas Kuosmanen. 

an image from Marco (LM) Lamberto
Image from Marco Lamberto.