Bake cupcakes in orange and green baking cups. Cool well before decorating.
Tint icing. Combine Leaf Green and Lemon Yellow for green shown. Divide icing and tint icing: 1/2 cup black, 2 cups green, 2 cups orange, reserve 1 cup white.
Mummy: Use spatula and black icing to cover top 1/4 of cupcake. Use white icing and tip 47 to pipe stripes for mummy wrapping. Add red gel to pipe drops of blood. Position candy eyeballs.
Pumpkin: Use orange icing and tip 1M to pipe swirls on top of cupcake. Use green icing and tip 352 to pipe leaf stem on top. Position candy eyeballs.
Monster: Use green icing and tip 2A to pipe swirls on top of cupcake. Position candy eyeballs.