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Center Homasote on one piece of felt. Wrap the fabric to the back of the board and staple at the center of each side. Make sure the felt is distributed evenly and pulled tight. Continue stapling around board sides, leaving several inches staple-free on corner edges.
Miter the corners by folding each point in toward the board, stapling in place along the edges and trimming away the excess. Fold down the fabric that remains and staple in place to finish the miter.
Attach the boards to the wall with wall anchors and screws. Glue a small piece of felt to cover each wall anchor where it attaches to the board. Cut images out of contrasting felt using stencils or computer-generated figures for patterns.