I fell in love with the scan when I first saw it, and had been playing around with it, trying to wall it for few weeks/month. My initial idea was try and paint the whole thing, but failed miserably. After the 10th time of failing, I (finally) realized that I was simply too noob to paint the darn thing. \(*o*)/ noob.

By the time I realized that I was too noob for painting, the whole thing was driving me crazy, so I kinda snapped and added smoke brushes all over the wall. And then put whole bunch of textures that I collected for my last wall, and then ended up with this.

edit:
This is the scan I used for the wall.