There are a few resources on dorm decorating tips. Do a google search and I'm sure you'll find some examples.
Recently, I finished a photo mosiac jigsaw puzzle of mickey mouse composed of different scenes from Disney movies and I bought a frame. All I need to do is glue the puzzle down and I have a nice wall hanging. My RA freshman year decorated his room with a border of webcam pictures he took of people who visited his room.
I read somewhere the key to decorating is have one piece of furniture you really like and base the entire room off of it; matching patterns, colors, and styles. Something I plan on doing is to bring in some lighting fixtures so I won't have to use the harsh flourescent overhead lights in the room.