Seashell Dinnerware. Add a coastal vibe to your tabletop with nautical sea shell plates featuring a single glamorous fluted clam shell illustration on a white background. 10" dinner plate manufactured from revolutionary ThermoSāf® Polymer resin that is safer and more versatile than Melamine plastic. Safe, re-usable plastic dinnerware. Perfect for outdoor dining. Our beautiful dinnerware is custom-printed, made-to-order. Browse coordinating serveware and linens.