My friend has a giant American Flag. I suggested he put 1/2" thick textured carpet pad behind it.
example, search Bed Bath and Beyond, many exist
Mohawk Home Felt Rug Pad 1/2" Inch Thick Plush Comfort Cushion - Grey - 5' x 7'
Wool Blankets as Room treatment
Just noticed Pendelton has some really nice wool blankets that can be hung on the wall. They even sell the fixturing. I would assume the wool blanked would have some beneficial properties for a blank wall?