Melt the butter in a medium-sized sauce pot.

Add the marshmallows and melt, stirring frequently.

Once smooth, remove from the heat, add the food coloring until desired shade of green.

Pour over the cereal and mix quickly, until the cereal is all coated.

Form in wreath shapes on parchment paper.

Decorate as desired.

Pop into freezer to complete setting.

Store in a tupperware container lined with parchment paper, putting a sheet between the layers of cookies.