Here is a nice set of 20 Photoshop Grunge Brushes made for Photoshop cs versions Up to 2500 px sized brushes. Can be used in your photoshop works such as graphic, website designs, brochures, business cards etc. They should now be compatible with all Illustrator CS versions although the earliest version of Illustrator. Also all the brushes are in one file, hope this helps!
Please read the terms and conditions of the respective user before use this for commercial purposes.