Bake and cool Lightning McQueen cake. Ice cake sides, background areas, headlights, mouth, front windshield, side windows and blue lightning bolt smooth. Using tip 3, outline car details and number; add dot rivets on hood. Pipe in eyes with tip 3 (smooth with finger dipped in cornstarch); add tip 3 dot pupils. Cover tires with tip 16 lines. Cover car, lightning bolt and number with tip 16 stars. Add tip 3 outline muffler. Pipe tip 21 shell bottom border. Position cake on fondant-covered board.
* Combine Leaf Green with Lemon Yellow for green shown. Combine Violet with Rose for violet shown. Combine Brown with Red-Red for brown shown. Combine Lemon Yellow with Leaf Green for yellow Piping Gel highlights shown.