Hmm, this discussion of design walls has be eyeballing a wall in my bedroom, because my sewing room is too small for a design wall. I do have a 3x3 design wall made from foam core board covered with flannel. It works, and can be hidden behind a sewing cabinet when not in use, but is too small for a whole quilt. I'm liking the tablecloth idea, but I do have some fleece that isn't being used. The cheap batting seems like a good idea, but you'd have to glue it to something to prevent it from sagging.