My room is pretty weird right now, in terms of decoration. The vast majority of the ones I have hanging up are from a small, high quality collection of reproduction Soviet Political Posters. I also have a few Star Wars posters, as well as a few different maps (Hurricane Evac routes, New Mexico), and some random sketches/odds and ends which amuse me. Honestly, my walls are pretty bare ... I mostly watch Television and read in my room, so the decoration of my walls beyond a minimal "Hey, I live here!" point isn't really an issue for me. Oh! I also have two United States flags in my room, though only one is actually on the wall.
I forgot to mention that I'm in the market for a few new posters. I really wouldn't mind having a few from some of the old Presidential candidates whom I never had a chance to support (alas, being a late 20th century birth!) like Goldwater, or Eisenhower.