In microwavable bowl, microwave pink candy melts and 1 tablespoon of the shortening uncovered on Medium (50%) 1 minute, then in 15-second intervals, until melted; stir until smooth. Repeat with purple candy melts and remaining 1 tablespoon shortening. Dip tip of 1 lollipop stick about 1/2 inch into melted candy and insert stick into 1 cake ball no more than halfway. Repeat. Return to cookie sheet. Refrigerate 5 minutes. Remove from refrigerator a few at a time. Dip half of cake balls into pink candy and half into purple candy; tap off excess. Poke opposite end of stick into foam block. Let stand until set.