Make cookies 1 day in advance. Prepare and roll out cookie dough following recipe directions. Use helmet from set to cut cookies. Bake and cool cookies.
Fill in cookies 1 day in advance. Prepare Color Flow icing following recipe directions. Tint portions blue, green, brown and a small amount black. Reserve some white. Use tip 3, cut disposable decorating bags and full-strength tinted icing to outline football helmet. Use thinned tinted icing in cut disposable decorating bags to flow in icing. Let dry overnight.
Decorate cookies. Use tip 2, cut disposable decorating bag and full-strength black icing to pipe black stripe and dot ear hole. Use tip 3, cut disposable decorating bag and full-strength white icing to pipe facemask and stripe. Let dry 1 hour.