Hit up one of the poster vendors that usually visits university campuses to get some wall decoration.
A RGB lighting strip around the roof perimeter can do wonders for setting the mod of the room.
If you have want to have people in your room to hang out, consider getting a futon instead of a bed. Won’t do your back any favors, but will be more functional during the college years.
Rather than no socks, get a pair of no-show socks. Especially if you’ll be wearing them on multiple occasions where your feet will sweat, otherwise you’ll probably get blisters and eventually your shoes will stink very badly.