Heat oven to 350°F. Make and cool cookies as directed.
Remove 1/2 cup of frosting; tint remaining frosting with orange gel food color. Frost 8 cookies with white frosting. Frost 8 cookies with orange frosting. Place remaining orange frosting in food-storage plastic bag, and cut small hole in 1 corner.
For bats, use white-frosted cookies. Place 1-inch spiral of string licorice in center of each cookie for body. Pipe wings on sides of body with orange frosting. For eyes, attach 2 green baking bits onto body of each with frosting; squeeze a dot of black decorating gel in middle of each eye. Place 2 miniature chocolate chips on each for ears.
For cats, use orange-frosted cookies. Unroll and separate string licorice; place pieces of string licorice on cookies to look like ears and whiskers. Attach 2 green baking bits to each for eyes and 1 miniature chocolate chip for nose.