I have a CU (commercial use) freebie for you today. It's a pack of 5 12x12 desaturated grunge overlays created at 300 ppi. Use them with any graphics program that supports layers (i.e. Photoshop, Photoshop Elements, PSP). Just place them in a layer over your paper or element and adjust the blend mode and --- voila, instant grunge and interest.
Just click on the preview above to access the download link. Enjoy!!