Spray 16 (1-oz.) plastic shot glasses with cooking spray.
Add 1-1/3 cups boiling water to lime gelatin mix in medium bowl; stir 2 min. until completely dissolved. (Do not add cold water.) Refrigerate 12 to 15 min. or until slightly thickened.
Meanwhile, add remaining 1/3 cup boiling water to grape gelatin mix in small bowl; stir 2 min. until completely dissolved. Spoon about 1-1/4 tsp. into each shot glass.
Let set 5 min.
Spoon lime gelatin over grape gelatin in glasses. Refrigerate 3 hours or until firm.
Unmold JIGGLERS onto tray just before serving. Insert 2 licorice pieces into opposite sides of JIGGLERS for the neck bolts. Decorate with gel to resemble monsters as shown in photo.