Slumber Party Cake

Ingredients

• ["Cake Mix", "1 (18 1/4 ounce) package white cake mix, prepared according to package directions (*see note)", "3 eggs (*see note)", "1 cup water (*see note)", "1/3 cup oil (*see note)", "Decorations", "1/8 teaspoon green food coloring, plus", "4 drops green food coloring", "2 (16 ounce) containers cream cheese frosting", "5 Hostess Twinkies (see Note)", "5 large marshmallows, flattened to 1-1/2 \" x 2-inch""