Decorate cupcakes. Using green icing pouch with round tip, pipe V on each iced cupcake. Using red icing pouch with round tip, pipe small upside-down V inside large V. Using green icing with round tip, pipe two lines extending from end of red V to bottom of cupcake.
Using green icing with round tip, pipe horizontal lines starting from center of V’s where red and green lines meet and continuing down to bottom of green V.
Arrange cupcakes, red V point upwards, into tree shape.