To execute this sea serpent, slip a striped knee sock onto your arm and install a folded oval mouth plate inside the toe box, lining the interior with turquoise felt. Cut four sharp triangular fangs from pearlescent white vinyl or stiff white felt, gluing two to the upper palate and two to the lower jaw. Cut eight six-inch lengths of varied blue, teal, and silver satin ribbons, bunching the ends together and gluing them to the left and right sides of the jawline to create flowing side gills. Cut a twelve-inch strip of two-inch-wide pleated iridescent craft ribbon or folded tulle, gluing the base edge along the top spine of the sock to form a continuous, flowing dorsal fin. Add two large dome-shaped crystal googly eyes to the upper forehead, securing the plastic eye bases with strong tacky fabric glue to ensure they withstand active play.