Plaster of Paris
Disposable mixing containers
Disposable mixing utensil such as a Popsicle stick
5-8 toilet paper rolls
Tape off the bottom of your toilet paper rolls with Duct tape nice and securely. Then line the insides of the rolls with wax paper. Place rolls on a wax paper lined baking dish, or cookie sheet. Set aside.
Mix 1 cup Plaster of Paris to the ratio of water recommended on the box. Mix in desired amount of tempera paint to reach your desired color. A few tablespoons should do the trick. Mix thoroughly.
Pour the mix into the toilet paper rolls and let sit a few hours. When plaster is hardened, peel the roll away from the chalk and continue to let dry a few days. Throw used containers and mixers in the trash. You don't want plaster clogging your drains. ;)
Now, go play some hopscotch with your kids! So much fun!!!