DH made me a design wall of PVC pipe. Two 4' x 6' frames. Then we made a pillowcase like cover for each of them with CHEAP wide flannel on one side and some old crappy fabric on the other. By placing them side by side a client laid out the blocks for an entire queen size quit (without borders). Since I wanted to keep the design up and sew by groups we did use pins to hold in place. It worked fine for the designing part and can be taken apart and reconfigured for different projects.