1. Work the clay in your hands to make it warm and pliable. Form a ghost with a 3/4-inch ball of clay. Pinch the top into a flat, rounded point; then pinch out two small arms from the sides. Flatten the center and then lengthen the remaining clay so it ends in a point. Twist the pointed end under and around to give the bottom a swirling effect.
2. Press the rhinestone mouth and seed-bead eyes in place. For necklace pieces, pierce a darning needle or toothpick sideways through the top of the ghost to make holes for stringing.
3. Bake according to package instructions. Thread pierced ghosts onto the leather cord, tying knots in the cord to separate the ghosts. Glue remaining ghosts to earring backs. Let the glue dry.