I had an idea to add fake graffiti (via Photoshop) to a plain brick wall. Unfortunately, I don't seem to be creative enough to come up with cool looking graffiti on my own.
So, here is a photo of a brick wall (click for the full size version):
I would like to see how creative you all can get with this wall and a few cans of spray paint. Have at it and post your results here.
Also please briefly explain how you did it (layer blending modes, styles, etc.)