Also in advance: Make cookies. Prepare and roll out dough. Use pattern to cut smoke. Use Cake Circles as a guide to cut one 8 in. and two 6 in. circles for wheels. Use medium Cut-Out to cut 11 rounds for axles and lug nuts. Cut 2 strips, 1 x 13 in., for roof trim. Cut 1/2 x 8 in. strip for connecting rod.
Bake and cool cookies. Ice cookies by pouring on color flow icing. For large wheel, use largest Cut-Out to mark center circle; outline with tip 3, fill in and let set before covering outer area. Cover wheels, axles, lug nuts and 8 in. connecting rod with thinned icing. Cover cloud with full-strength icing. Let all dry overnight on waxed paper-covered boards. Use full-strength icing and tip 6 to pipe smoke outline and message. Let dry.