Make nonpareils-sprinkled candy cane one day in advance. Use tip 2, cut parchment bag and full-strength white icing to outline candy cane divisions. Use cut parchment bag and thinned red icing to flow in icing. Let icing set 1 hour. Use tip 2, cut parchment bag and thinned white icing to fill in remaining sections. Immediately cover in white nonpareils. Let set for 1 hour, gently tip cookies to remove excess nonpareils. Let icing set 8 hours.