I bought two sheets of 4 x 8 insulation board at Lowe's. It has the silver backing on it. I think it was about $5 per board. I stapled cream colored felt on on them and then stapled it to my wall. The heavy duty staplers will hold perfect and no damage to the wall at all. Eleanor Burns recommends the fabric used on the interior roof of vehicles. It will hold cotton fabric like a magnet. You can find that at most car repair shops.