I used the Freaky Monsters Cupcake Kit that I picked up at Target. The recipe below is what's needed for the cupcakes without the kit. The frosting recipe is adapted from the recipe provided with the kit.
Using an electric mixer, beat 4 tablespoons of butter on high for one 1 minute until light and fluffy.
Add 1 cup powdered sugar and one or two drops of purple food color and beat on low until combined. Add more food color, if necessary, until the color is dark. Add 1 tablespoon of milk and beat on high until reaching the desired consistency adding more milk if necessary. Repeat steps to make orange frosting.
Spread frosting on cupcakes (six purple and six oranage). Decorate with candy eyes, candy corn, and black icing.
Make your creatures appear furry by dragging a fork through frosting before adding other features.