Bake and cool brownies in sheet pan. Cut out carriage shapes using cutter. Coat back of carriages in melted candy; let set on waxed paper.
Cover carriages with melted candy; let set. Trim off excess candy if needed. Attach wheels and handle with melted candy; let set. In buttercream, pipe tip 2 dots for wheel axles and on carriage hood in scroll design.
*Combine Juniper Green with Leaf Green for green shown.