Roll out dough; trace hat pattern using toothpick. Cut out cookie; bake and cool. Outline hat with tip 3; fill in hat and brim with tip 16 stars. Pipe in tip?12 hat band and buckle (smooth with finger dipped in cornstarch).
Trim facial features from cake. Ice sides and background areas smooth. Pipe in mouth with tip 7 and tongue with tip 4 (smooth with finger dipped in cornstarch). Add tip 3 string eyes. Cover face with tip 16 stars; overpipe nose. Outline pot with tip 3; pipe in with tip 12. Smooth with spatula. Add tip 12 band rim. Outline rest of body with tip 3; build up arm areas with tip 12. Cover arms, legs and shoes with tip 16 stars. For socks, pipe tip 16 vertical stripes in alternating light and dark green. Pipe tip 16 star hands. Pipe tip 6 outline shoe buckles. Add tip 16 swirl hair, beard and pull-out star eyebrows. Pipe tip 21 star bottom border.
Position hat cookie on cake; position large marshmallow to support cookie overhang. Position candy coins.
*Combine Leaf Green with a little Lemon Yellow for light green used on cuffs and socks.