These are some color variations on a grunge overlay. There are several more colors that I may upload later if you guys like them. The grayscale one can be used easily as an overlay for whatever colors you'd like, too.
I uploaded them to my Flickr gallery weeks ago and totally forgot that I had't posted the zips. Sorry about that. I'm going to get with the program now. Zips will be up as soon as they finish uploading.
5.13_Monochrome Grunge, a set on Flickr.Brushes are by bittbox.com and designerfied.com.