Heat oven to 350°F (325°F for dark or nonstick pan). Place paper baking cup in each of 24 regular-size muffin cups.
Make and bake cake mix as directed on box for 24 cupcakes. Cool in pans 10 minutes; remove from pans to cooling rack. Cool completely, about 30 minutes.
Stir food colors into frosting for purple color. Frost cupcakes.
To decorate each cupcake, sprinkle miniature chocolate chips along top for hair; use 2 candy-coated candies for eyes, 3 licorice candies for nose and mouth and 2 white baking chips for fangs.