redecorating my room...?

i'm not really looking to paint it, just replace my desk and move things around. but i'm interested in taking what i have and making it look different... any little cute ideas? things i could hang, ways to do my closet, interesting things? i have stuff taped ALL over my walls, so posters or anything wouldn't help (i have no more room... i like things cozy, like i'm boxed in, and all of the things on my walls help me feel secure, i think). i'm looking to add useful things to my room and not just little decorative crap pieces. my room's very colorful and bright with aqua walls.