Yes you can make your own brushes, make your design then Edit > Define Brush. That's how all those brush packs were made.
Dirty,
http://www.gamerenders.com/forum/index.php?showtopic=2298There's a tut on how to make your own brushes, if you want some premade ones I suggest you do a Photoshop (Your version) Brush Pack search on google.
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thanks tec.