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]