This is a little bit niche, but if you'd like to have some truly cool, distinctive posters for your dorm room or apartment, you could do worse than Rachel E. Morris' awesome series of prints created on commission for the NYU Game Center's "Practice" lecture series.
You can check out all of the various posters here—highlights include Portal 2 scribe Erik Wolpaw's talk, as well as the Open Library drawing, and the beautiful image for Thatgamecompany's Kellee Santiago. Chris Hecker's Spy Party also gets a groovy print.
As video game posters go, it's hard to get classier.
Practice Prints [Rachel Morris]