I use large corrugated sheets of cardboard that computers had been packed in. I have 6 that are approximately 18" x 36"and about 3/4" thick. Each is covered in white flannel. I store them side by side. When I have a large quilt, it mostly works, when I have a small quilt, it always works! I have a counter top in my sewing area so I stack two on the counter and then lean two on the bottom of the counter top. I kind of add the remainder as I go along. It's a choppy way to get things done, but for now that is all I have to work with. Storing them is easy and doesn't take up a lot of room. It is also nice to just a take a board or two over to sewing machine and work off the board (small quilt). Anyway, that is how I have been dealing with a homemade design wall.