Combine Leaf Green and Lemon Yellow for green shown. Cut lollipop stick to 3 in. length and dip into melted candy; insert inside triangle-shaped corn snack for support and refrigerate until set. Remove from refrigerator and dip entire corn snack into candy and insert into craft block to dry.
Bake and cool cupcake. Pipe tip 12 pumpkin segment lines on cupcake in orange buttercream. Pipe tip 5 yellow dot eyes and tip 5 green pupils (smooth with finger dipped in cornstarch). Outline and pipe in tip 5 nose and mouth in yellow buttercream.
Insert stick with candy-coated corn snack into top of cupcake. Pipe tip 104 ruffle brim on hat in brown buttercream. Pipe tip 3 green band in green and tip 3 buckle in yellow buttercream.