It's a matter of getting some grunge photos/images, and 'layering' them in Photoshop on your image/photo. I believe I used 'overlay.' And, I don't even know if I did this right. But thanks for the compliment.
Looks good, I like the second one better, it's more subtle. I think the cracks are too pronounced on the first, maybe lower the opacity a bit. I have been using textures a lot lately, they can really add some interest to an other wise normal photo.
-Kevin
I like the second one the best. I would echo Sacksnack and lower the opacity of the first one and see what you get. I bet it would be killer. Your color and composition are perfect.