ADD several drops of green food coloring (around 5-7 drops) and a few yellow drops of food coloring (around 2-3 drops) to milk to get desired lime green color. Whisk until blended.
BEAT pudding mix and green milk in medium bowl with whisk for 2 minutes.
POUR pudding into five 6 oz. dessert cups. Refrigerate at least five minutes to set pudding.
COVER with crushed chocolate sandwich cookies to resemble dirt. Insert candy decorations (such as zombie hand) into top and refrigerate until serving.