1Line cookie sheet with waxed paper. In microwavable bowl, microwave candy melts and shortening uncovered on Medium (50%) 1 minute, then in 15-second intervals, until melted; stir until smooth. Dip half of each sponge cake in melted candy; tap off excess. Place on cookie sheet. Immediately attach 1 licorice piece to each side of cake for neck bolts. Add candy sprinkles to tops of cakes for hair. Let stand until set.
2Spoon remaining melted candy into resealable food-storage plastic bag; seal bag. Cut tiny hole in corner of bag; squeeze bag to pipe eyebrows and nose onto each cake. Let stand until set. With white icing, pipe whites of eyes. Use black icing to pipe pupils of eyes, mouth and scars.