In advance: Make candies. Mold red lips in candy mold, filling cavities just 3/4 full. Tap to settle; chill until firm.
Also: Make cookies. Prepare and roll out dough. Cut cookies using largest heart cutter from set. Bake and cool. Cover with thinned icing. Let dry 24 hours on waxed paper-covered board.
Push Cake Sparkles through tea strainer for a finer texture. Using full-strength icing, pipe tip 4 message; immediately sprinkle on Cake Sparkles. Let set, then brush off excess. Attach candy lips with icing.