Sometimes when you're working with a client they will ask for some "grunge" and it is your duty to make that grunge happen. Grunge can happen anywhere, but most often it happens on walls! Using a few photoshop brushes this is easier than you may think.
For this tutorial I've decided to go with a style that fit my favorite game at the moment. Gears of War - Yes it is an awesome game. The graphics, and styles of the website are very cool as well. That is what I've tried to capitalize on in this tutorial.