Crochet in the round using cotton yarn and a 2 1/2 inch foam ball. The foam balls were bought at Hobby Lobby in a six-pack for less than $3. Single crochet in a magic loop and pull to form the center. Crochet around and around until you get to the other side where you need to decrease back to a center spiral. Leave a long tail of yarn to secure tightly with a yarn needle. Crochet the whole six-pack and place in a bowl for decoration. Children can play safely with these. The ball I made was loved and lost when it rolled under the couch while our dog, Kiwi, was enjoying it.