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Prepare dough. Bake and cool cookies according to package directions.
Prepare Color Flow icing. Tint portions black and green.
Use tip 3 and full-strength green icing to outline skull and crossbones. Use a cut parchment bag and thinned green icing to fill in skull and crossbones. Let set until dry.
Use tip 3 and full-strength black icing to pipe eyes, nose and mouth. Let set until dry.