After letting the blown up balloon sit overnight, release the air. Stretch the opening over the funnel. Pour rice into funnel top. Pull down on balloon as you are filling it with rice. This will help get the maximum size for the ball.
Carefully cut the neck of the balloon off. Using one of the previously cut balloons, wrap around the filled balloon, sealing off the opening. Stretch the remaining balloon over the ball. You're done! These remind me of the stress-balls that they sell in the store. They are durable and lots of fun to play with. Have fun!
SHOPPING TIPS: This is a VERY cheap project! I bought a bag of 25 balloons for $.88! I had the rice at home, so this project was dirt cheap. Happy Shopping!