There was a 40% off sale at Joann Fabric and I was able to get enough speaker cloth for just $30! And it looks fine to me, even better when the entire wall and frame is painted black. Can the same cloth be used for wall treatments/panels? I'm guessing it can.. Now it's just a case of making the panels. I'm off to HD to pick up a miter box and some furring strips to get the ball rolling. Have about 9 panels to make just for the wall!