I covered two 8 x 4 foam insulation boards with felt and stapled them to my wall. The foam staples great and doesn't leave a noticeable hole to repair. I cut another big foam board into several sizes and use those for bulletin boards and to arrange single blocks. It's amazing how fast a board will fill up with random stuff. My DD put a 8 x 4 covered foam board in my DGD's room. It holds everything from purses to jewelry with pretty push pins.