Sanibel Island, Florida, with its 17+ miles of beaches ripe with coquinas and sand dollars, is a favorite shelling beach. So, too, are is the sand of San Jose Island, Texas, with its olive shells and wentletraps, lightning whelks and sundials, and of Silver Strand State Beach on Coronado Island, California, littered with silvery oyster shells, … More Treasured sculptures of the sea