In a large non stick pan, melt the butter on low heat. Add the marshmallows and stir. Once slightly melted begin adding as much food coloring till you get the desired color you’d like.
Make sure to keep stirring. Once completely melted turn off the heat and add in the Rice Krispie cereal one cup at a time and stir after every cup. Stir and fold until everything is well mixed and coated. Let cool slightly.
Lay down a sheet of parchment paper on a baking sheet. Coat hands with cooking spray and grab chunks of the rice krispie mix and form into balls ( I made small, medium and large ones, large being slightly smaller than an apple.)
Once the balls are formed, press down on the top and bottom of the ball to make a pumpkin shape. You can use a finger to make a dent where the pretzel rod goes or you can just push it in. Place them on the parchment paper.
Break the pretzel ends to use as stems, place into the middle of the top of the pumpkin. Using scissors, cut little leaf shapes out of the airheads (the corners worked best.)
Cut along the long part of the airhead very thinly, roll out into a small rope. Wrap it around something thin like a skewer stick to make a twisty vine.