In medium microwavable bowl, microwave candy coating on Medium (50%) 1 minute, then in 15-second increments, until melted; stir until smooth. Remove several cake balls from refrigerator at a time. Dip tip of 1 lollipop stick about 1/2 inch into melted candy and insert stick into 1 cake ball no more than halfway. Dip each cake ball into melted candy to cover; tap off excess. Poke opposite end of stick into foam block. Sprinkle cake ball with sugar crystals. Let stand until set.