I also took a graffiti workshop with a friend at the museum, and I absolutely loved it! I don't know, there's just something really cool about spraying paint to one work of art. We all got our own panel to spray, and I made an angel character. I will post a photo of it later, because it's really big and I couldn't take it home with me. I have to get it later... I think it will be nice decoration for my room.^^
Awesome vid: