Melt Bright White, Turquoise, Yellow and Pink Candy Melts, separately, according to package instructions.
Prepare decorating bags, separately, with melted candy. Cut medium hole in tip.
Place doughnuts on cooling grid positioned over parchment paper. Pipe melted candy on doughnuts, alternating colors. Tap lightly to remove excess. Immediately sprinkle with white Sugar Pearls and nonpareils. Transfer doughnuts to parchment paper-lined cake board. Chill until set, about 10 to 15 minutes. Reserve remaining Bright White and Pink candy for next step.