In my dorm, I am not allowed to use tape, nails, or adhesive hooks on the walls or furniture. what do i use??

I am a very creative and organized person. I want to bring some things to put up on my side of the walls like pictures and art, but were not allowed to use nails, tape or anything that damages the walls. Do you know any material that is strong enough to hold a canvas up a whole semester, yet stays within the rules of our dorms?