This wreath is really dressed up for summer, thanks to a clambake's worth of mussel shells. You'll need about 80 clean shell halves, a glue gun, and a 10-inch double-wire wreath form. Start by gluing shells between the wires, below, tucking the heel of each under the one set before it. Then attach two more courses of shells, one on each side of the first, arranging them in the opposite direction. Use monofilament to hang the wreath securely, and cover the cord with a ribbon tied in a decorative knot.