22 to 24 cm. Seashells can make for standalone displays or perk up objects around the home. Seashells are a great and attractive way to decorate your home. They convey the relaxed but lively ambiance of the seaside. Usually, people rarely look at shells as objects of home decor. But shells in different sizes and shapes, and in their natural colors, simply kept in a shallow basket along with colored marbles in the bathroom. These not only bring in a breath of freshness into the interiors, but are also unique in representation and vibrant in decor. Cowrie shells, scallop's, barnacles, cones shells, urchins and starfish make beautiful home decor displays.