Line cookie pan with parchment paper.
Melt Dark and White Candy Melts, Yellow and White Candy Melts or other favorite color combinations, following package instructions. Spoon candy into prepared pan pouring colors randomly. Tap pan on counter to remove air bubbles. With spoon or butter knife, gently marble candy in pan; if needed, smooth top with large spatula. Sprinkle your favorite sprinkles. Chill until firm, about 15 minutes. Remove parchment from pan; break candy into smaller serving pieces.