Having an artistic roommate is awesome! I got talked in to painting my large, empty living room wall with black chalkboard paint. While the idea of having a wall I can draw on is awesome, I was scared about a giant black wall in the living room.
Not only does it look awesome, I came home to the first coat completely done...and the second coat went on last night. My living room is full of "temporary art" that I can change on a whim!