One week in advance: Prepare gum paste following package directions and tint green. Roll out gum paste 1/8 in. thick and prepare the following (make extras to allow for breakage):
Ring Spacers (to raise tree branches): Cut 1/4 in. wide strips, wrap around plastic dowel rods, trim ends evenly and let dry. Star Branches:
Using all cutters except the smallest, cut 2 stars of each size. Using a plastic dowel rod, cut out center holes. Lay stars on cornstarch-dusted surface to dry several days.
Tint a small amount of fondant yellow and cut out one star using smallest star cutter. Lay on cornstarch-dusted surface to dry. Using royal icing, pipe tip 1 lines on star branches. Let dry.