Roll out cookie dough and use pumpkin cutter to cut carriage and medium round Cut-Out to cut 2 wheels. Bake and cool cookies.
Use orange royal icing and tip 3 to outline carriage. Use tip 3 and yellow royal icing to outline window. Thin orange royal icing to piping consistency and place in cut disposable bag; use to cover top of cookie with icing. Let dry.
To decorate wheels, position round cookies on cooling grid placed over cookie sheet. Thin violet icing to pouring consistency and cover wheels; let dry.
Use tip 12 and green royal icing to pipe witch's head; pipe tip 3 pull-out nose. Use tip 104 and black royal icing to pipe hat brim and tip 12 to pipe hat top. Pipe tip 3 hat trim in violet and buckle with tip 2 in yellow royal icing. Pipe tip 3 yellow dot eyes with tip 2 black dot pupils. Pipe tip 3 pull-out violet hair. Pipe tip 1 mouth outline in black.
Use tip 2 and black royal icing to pipe spider webs on wheels. Attach wheels to carriage with orange royal icing.
Combine Leaf Green and Lemon Yellow for green shown. Combine Lemon Yellow with a small amount of Golden Yellow for yellow shown. Combine Violet with a small amount of Rose for violet shown.