Having a new version of the texturemate website up has gotten me pumped to start uploading more content! Here is a flames or fire brush set that I made from some of my fire texture stock images. I keep an ancient version of Photoshop 7 around to create brush file .abr's so that this should work with anything newer, as well as Gimp. These brushes are pretty fun to try to emulate fire and flames with. I like to brush different layers with various reds, oranges, yellows, and even white and then soften and fade them. Blur/dodge brush tools also work well with these fire brushes. If these get popular, I will create some more since I have some other fire textures.
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