Originally Posted by kathy
I bought a 4x8 sheet of foam insulation and covered it with felt because it was cheap, some blocks will stay on their own, some need a pin
Ooh, that's a good idea. I don't have space for a design wall right now, but I plan to have one when I find a new flat. Most of the time I'm using freezer paper templates (I use the Ruth McDowell method), so the pieces won't stick to a standard design wall that's a sheet or what have you, they need to be pinned. (I have one 22" x 26" wall hanging whose size was determined by the largest cork noticeboard I could find, which is all I have at the moment.) Putting felt/flannel/whatever is cheapest that fabric will stick to on top of foam insulation sounds like the best of both worlds. I'd been thinking of cork, which would be rather expensive, although on the plus side the sound insulation may be useful.