I put poster board from the Dollar Tree on a large wall (used small finishing nails...and taped the pieces of poster board together)--that is my design wall and it works great for sandwiching quilts. I had planned to put flannel on it, but never got that far, so I just use pins to hold it on the wall. I spray-baste quilts, and the poster board protects the wall from the spray. Cheap solution that works!