This is fun for St. Patty's Day to serve...
1 pkg white cake mix, 2 pkgs (3 oz.) each lime gelatin, 1 cup boiling water, 1/2 cup cold water.
Topping: 1 cup cold milk, 1 pkg instant vanilla pudding, 1 8oz. container whipped topping, green sprinkles.
Prepare and bake the cake according to the package directions, using a greased 13" x 9" x 2" baking dish. Cool for 1 hour. In a small bowl, dissolve the gelatin in boiling water; stir in the cold water and set aside.
With a meat fork or wooden skewer, poke holes about 2" apart into cooled cake. Slowly pour gelatin over cake; refrigerate. In a bowl, whisk milk and pudding mix for 2 minutes; let stand for 2 minutes or until soft-set. Fold in whipped topping. Spread over cake. Decorate with sprinkles. Cover and refrigerate until ready to serve.