Blow up a balloon so it is about 8 inches long.
Draw a circle (1 1/4 inch diameter) about six inches from the bottom of the balloon. Tie the string around the knot that's holding the air in the balloon.
Use the rolling pin to roll out two large pieces of clay that are about 1/4 inch thick.
Wrap the two pieces of clay around the balloon, leaving a space around the hole that you've drawn. Use the back of a spoon and some water to smooth out the seams. Use extra clay to add decorative elements, if desired.