PSD Nation is committed to bringing you the very best free Photoshop resources on the net. Check out these great, grunge brush packs.
Sidewalk Oil Stains

Splatter Brush Pack

Dot Splatters

PSD Nation is proud to present our latest pack of unique, custom-created photoshop brushes. This pack contains 7, hi-resolution explosion brushes for you to use in your designs, both commercial and non-commercial.
Download the .abr file today – explosion_brush_set.abr

Hot off the presses come these great new photoshop brushes. Very well worth checking out, download today and get creating!
Splat Brushes

Aztec Brush Pack

More Spatter Brushes