I'm not Einstein here, but we recently got a new mattress, and kept the old one for the kids when they come to visit. I didn't want to put it in the basement to get mildewed. So, I cleaned out a place for it against the wall in my sewing room. Lo and behold, a design board! I keep a mattress pad on it to protect it from dust, my inspirations are pinned to the pad. When the kids come I just take off the mattress pad, my designs are saved, and they no longer have to sleep on the couch.