The simplicity of this arrangement makes it perfect for almost any room. Add a cake candle or several votives to a basket of shells, or arrange several shells around the base of your favorite scented candle. Place smaller shells around the upturned shell so that it doesn't tip over. A variation on this idea is to take a shallow container, fill it with white beach sand, and place a group of shells, bowl side up, in the sand. Add votive candles.
Old jars filled with shells make lovely displays.
Fill your favorite antique jar to the top with shells of different sizes. With pinking shears, cut a circle from a pretty piece of cloth and place it over the mouth of the jar. Be sure to cut it large enough so that you can pull it into a ruffle, then tie with jute twine or matching ribbon. You might even like to add a decorative craft butterfly or a seagull feather. Seashells make wonderful wind chimes, too.