My foam insulation is purple, from Home Depot - 1" x 24" x 96" and I trimmed off a little more than 10" so it would fit in my space. I had to get a friend with a van to help me get it from the store. They were around $14 each. All together it cost about $40 for the materials and took about 2 hours.
|sewing room before the design wall|
|taping on the flannel to the insulation|
|design wall up with one lonely quilt block on it|