As you can see, we all have a few ideas!!
Design wall is great. I have had two different ones. I had fleece yeardage that was just sitting around (it was tan and matched my walls) so I put it up on the wall for an instant design wall that also helped with sound control. If you go this route, place a slat on the top and roll the fabric around once and nail to the wall. At the bottom, place two slats for double thickness and wrap the fabric around it and attatch. If you have double thickness at the bottom than the top you have a slight upward angle on the design wall. the fleece-like flannel hold the fabrics without much pins, the angle will help keep the blocks from falling off again without much pins. The fleece I had was 60 inches wide and I used that as my length so I had selvages top and bottom. I had about 2 yards in length. It was nice for a design wall. Have fun!