I have a 36" wall also. I tacked a yard stick to the wall up high to the ceiling and pasted some wooden clothes pins to it. The kind that clips. I hang a piece of flannel to those clips when I need a design wall and take it down when I'm not using it. It isn't the best solution I'm sure, but working in a small space sometimes you just gotta do it! I think it work on a door as well.