Preheat oven to 350°F. Line two half-sheet pans with silicone baking mats or parchment paper.
Open one can of Pillsbury Grands Cinnamon Rolls and set the icing aside to use later. Unroll one cinnamon roll and shape it into a Christmas tree by starting at the base of the tree and making a 2-2.5" line of dough, curving it up to make the next row slightly smaller, and repeating until all the dough is gone. Repeat shaping the rest of the cinnamon rolls from one can into trees, making sure to place only five trees per pan.
Bake the first pan in the 350°F oven for 23 to 27 minutes, or until golden brown. While the first pan is cooking, repeat forming the trees with the second can of cinnamon rolls. Remove the first pan from the oven, place on a wire cooling rack, and bake the second pan of cinnamon rolls.
After you've formed the second pan of cinnamon roll trees and while the first pan is still baking, prepare the frosting. Start by placing the Philadelphia Cream Cheese Frosting in a medium-sized bowl and the frosting that comes with the cinnamon rolls. Add a few drops of green gel food coloring. Beat everything together with an electric hand mixer until combined and uniform in color. If you need to, add a few more drops of food coloring until the desired color is reached. Please note that the color will darken as it sets on the cinnamon rolls.
While the cinnamon rolls are still warm, use an icing spatula to frost the tops. Transfer the frosted cinnamon rolls to a wire cooling rack and allow them to cool completely. Once cooled and right before serving, top with the Wilton Rainbow Chip Crunch Sprinkles to mimic lights and place a candy star at the top of each tree. Serve immediately.
Yield 10 Cinnamon Roll Christmas Trees