For each "Love" cookie sandwich, cut 1 heart with imprinter for bottom. If using Comfort Grip Heart Cookie Cutter, cut 2 with same cutter. For pink cookie, tint dough with pink icing color for top cookie and use double heart imprint. For double heart cookie, imprint on plain cookie dough.
Bake and cool cookies. For "Love" cookie, use Red Sparkle Gel to outline imprinted message and heart. If using Comfort Grip Heart Cutters, use Red Sparkle Gel to outline freehand design. Let completely dry. For pink cookie top (with plain cookie bottom), brush sides with Red Sparkle Gel and roll in Red Sparkling Sugars. Use disposable decorating bag fitted with tip 1 and red icing to outline hearts and white icing to pipe-in center of hearts. For double heart plain dough cookie, brush sides of top cookie with Red Sparkle Gel and roll in Valentine Nonpareils; brush sides of bottom cookie with gel and roll in Red Sparkling Sugars. Use tip 1 to outline and pipe in red heart and pink heart; position Jumbo Hearts Sprinkle Decorations on top.
Meanwhile, let ice cream soften slightly and spread 1/2 in. thick in jelly roll pan lined with plastic wrap; freeze to set.
Remove ice cream from freezer and use heart cutter without imprinter or Comfort Grip Heart Cutter to cut ice cream shape for sandwiches.
Place ice cream between 2 cookies and roll sides in sprinkle decorations.
Place cookie sandwich back in freezer until sprinkle decorations set.
Remove sandwich from freezer, place in plastic wrap; freeze until ready to serve.