Make your own street art and pass on to a friend to continue working. So far the continue part hasn't worked (for me) but it's still fun. It's the closest I'll ever get to spraying on a wall. HERE
Wouldn't you love to have the space to paint like Pollock? He rocked the splatters. Try this, HERE.
Scribbling is good. This will remind you how cool it is to just draw in your journal. HERE.