For the greatest flexibility in mounting 3-dimensional objects, your mounting surface should be foamboard. You will, of course, want to cover it with an attractive fabric like velvet or felt, but you will need the soft, workable nature of foamboard to employ the widest range of mounting methods. To mount loose items like necklaces, handkerchiefs and scarves, sew them to the surface of the mounting board using invisible thread and a pilot needle. For sports jerseys and other apparel, insert a sheet of cardboard or matboard into the item to give it form and stability, then sew through the item and into the foamboard. For balls and other round objects, make a shallow crater in the surface of the foamboard, cut away a small circle in the fabric over the crater, apply a dollop of silicone rubber sealer, and press the object in place. For cups, jars and other open-mouthed objects, cut a hole in the foamboard, slit the fabric over the hole and imbed the object in the surface. For knives, guns, spoons and plates, there are acrylic fixtures called Mighty Mounts that are designed to be anchored into foamboard to hold such objects. Mighty Mounts can be used for a wide range of other objects you may wish to mount.