At least 1 to 2 days in advance: Make fondant trees and star, using 24 oz. of white fondant. Roll fondant 1/8 in. thick. Using copper tree cutter, cut 3 trees for 6 in. cake top; with knife, cut 2 trees vertically in half. Using two smallest metal tree cutters, cut 12 of each size tree (24 total); cut trees vertically in half. Cut 1 star with smallest cutter from set. Position all pieces on cornstarch-dusted surface to dry. When dry, using royal icing, pipe tip 1 outline branches on trees and rays on star.