Hang Posters with Binder Clips
A couple of people in my office have showed me creative ways to use these binder clips. They have hung posters from the clips and affixed the clips to the wall using push pins. The clips look cool and anything lightweight can be hung with little damage to the wall. Real Simple suggests using the clips to display photos, pretty cards and even recipes when you're cooking. A photo and description are here. Click through the online gallery for more cheap decorating tips.