You will need:
Spray Paint (I like black best)
Two sheets of paper
Step 1: Getting Ready to Paint!
Cut out the lines of a city. You don't have to do a city! You can do flowers, animals, people, etc.
Once your out line is cut out, put it ontop of the main peice of paper. Weigh it down on every extended part of city. (If you don't do this, it won't look good)
Step 2: Spray!
After a few minuits take off the rocks and cut out. You are done!
Enjoy your new art!
Step 3: Optional Detail