Tweens are notorious for being a fan of one thing one week to totally flipping and loving something else the next. Shelving and under-bed storage leave room for them to store things until they're "cool" again.
Old door turned into a photo board.I did this at my former house and left the door there, but took the pictures. Need to do another in my new home. If it is where you see the back as mine was, use fabric to back the whole door.