Bake cupcakes in Winter Themed Standard Baking Cups, and cool completely on Cooling Grid.
Prepare Buttercream Icing recipe. Tint 3/4 cup icing with Kelly Green Icing Color; set aside. Ice cupcakes with white icing using Spatula.
For Christmas trees, pipe Open Star Decorating Tip 13 pull-out stars along the length of each pretzel stick. Gradually shorten the length of the pull-out stars as you pipe up the pretzel stick by piping longer stars on the bottom and shorter stars towards the top.
Arrange finished trees and Petite Snowman Icing Decorations on each cupcake.