It might a bit extreme but about a year ago i painted an entire wall and the door of my room with chalkboard paint. I found it at home depot for about 11 bucks per can (i needed 2 for smallish room). Here are some results.
(I love nintendo.)
It was really fun and anytime i got tired of the pictures, i just erased it. Just be sure you want your room black because its really hard to paint over.