Let pound cake thaw for approximately 10 minutes. (It's easier to cut and arrange if it isn't thawed entirely.) Leaving the cake in the foil pan, use a serrated knife to cut it diagonally into 2 triangles.
Using a knife or kitchen scissors, cut downward into each corner of the cake's foil pan packaging. Bend the foil pan's sides down to make it easier to take your cake triangles out of the foil pan.
Carefully remove each triangle cake piece and arrange them on a serving platter (or wax paper covered baking sheet) with the opposite sides together to make a larger Christmas tree-shaped triangle. (Hint: One of the triangle cake pieces will need to be turned upside down to do so.)
Add alternate green icing and whipped cream "garland" stripes across your Christmas Tree Cake.
Let the kids decorate the Christmas Tree Cake with holiday candy "Ornaments".