Melt 1 tablespoon of the butter in the microwave in a microwave safe bowl (or you can melt on the stove top in a saucepan).

Add the 1/3 of the bag of the marshmallows and microwave in 30 second increments (stirring in between each) until they are completely melted.

Add 4 drops of the green food coloring. Stir until the marshmallow mixture is the green color that you desire.

Gradually add in 2 cups of the rice Krispies cereal. Mix until completely coated.

Spread evenly into a large pan to cool slightly. We poured ours onto a jelly roll pan.

Follow steps 1-5 2 more times to make the orange and purple rice krispies as well.

Allow the mixtures to cool for at least 30 minutes. Do not refrigerate as it will cause the rice krispies to be too hard.

After this cooling time, form the rice krispies into small balls that are approximately 2 inches in diameter.

Gently press the eye candies into the side of the balls.

Allow the monstres to cool completely and then enjoy!