When I made my design board I just used batting I had laying around but with nothing behind it so pins don't stick well. 1st mistake I made on it. Just recently I read where someone used auto headliner with has a sponge type backing on it so will be replacing my present design wall with headliner fabric next. Thinking on either a pale beige or pale grey as there aren't a lot of choices in colors for headliner fabric. Also will make it wider.