1. Cut a piece of foam batting to fit the inside of your box. Fold fabric around it and cut, leaving 1/2 inch extra around the edges. Fold it in half, wrong sides facing out, and sew two sides together. Turn the pouch right side out, and stuff with the batting. Stitch up the open side, tucking raw edges to the inside.
2. Sew two or three buttons on top of the pillow, and tie twine around them to hold the rings.