Several days ahead, make the wheelbarrow: Tint cookie dough brown with golden yellow added. Using patterns, cut 2 front/back panels, 2 side panels, 2 supports, and 2 handles. Score wood grain design into dough using end of spatula. Cut 2 wheels using circle cutter; cut 1/4 in. wide strips of dough and position on wheels for spokes and rims. Bake all and cool. Thin brown icing color with a small amount of vanilla extract and paint into wood grain designs. Let cookies dry at least 24 hours on a flat surface. Tint royal icing to match wheelbarrow color and assemble using tip 16: Attach wheels, supports and handles, let dry. Attach side panels to front and back panels. Let dry completely.