From nativity scenes to ring dishes to wreaths and chandeliers, oyster shells are popular around South Carolina homes, especially in the Lowcountry.  For the artists who make those pieces and recipients who decorate with them, the shells can evoke memories of good food and company as well as serve as a reminder of how humans shape and affect the natural world.  “It brings back in the summer, the beaches, sand and the marshes,” said Jennifer Smith, co-owner of Charleston Oyster Wreaths Co. “Even if I was wearing an oyster necklace, it would make me think about being on the coasts and all the things that bring peace and a smile…