Decorating Project: Help Needed

This is the TA office. I think I'm the only person who uses it, as everyone else seems to have found an alternative. 

I'm going to spend a few hours a week here, and I don't want to be as sad as I was last week, hunched alone at my laptop and bathed in fluorescent light. Any ideas for how to spruce it up?

Given that (in theory) I don't have exclusive use of the room, I don't want to do anything crazy, overly personal, or expensive. I'm pretty sure I'd get in trouble for trying to paint it, and I can't replace the furniture because A) that would be expensive and B) that would be heavy.