I took the 10 grunge textures I made today for texturemate.com
and turned them into 10 high resolution 2500 pixel by 2500 pixel brushes! They'd be good for adding texture or background here and there. I didn't soften or blend the edges any so you can use them right up to their edges. Let me know what you think! Remember they are free for commercial use as well! Go here to Download!