To make windshield: place pattern on cardboard surface and cover with waxed paper. Tint melted white candy blue with candy color. Outline and pipe-in pattern with melted candy in cut parchment bag. Let set and carefully remove from waxed paper; set aside.
Position mini-loaf cake on foil-covered board. In buttercream, pipe tip 12 band around bottom of cake for bumper. Cover remainder of cake with tip 18 stars.
Using buttercream, attach candy wafer steering wheel, round jelly candy wheels, candy-coated chocolate headlights and hubcaps.
Pipe tip 21 clown and tip 18 star hands; insert clown head. Insert windshield. Insert spice drop on lollipop stick and insert stick in cake for antenna.
One of the most popular techniques, stars come in a range of sizes and styles. Experiment with open and closed stars for variation in look. The star technique is timeless and can be used as a classic border or as a stunning fill-in for the top of a dessert.