Decorate windows. Using reserved purple icing and tip 2, pipe window panes on each window.
Roll out dark blue fondant ¼ in. thick. Cut four window boxes, 3/8 in. x 1 1/8 in. in size.
Using fondant roller with pink guide rings, roll out remaining dark blue fondant. Cut four strips, 7/16 in. x 1 ½ in. each. Using damp brush, attach one strip around top of each box (strip should rest about 1/8 in. off top of box).
Shape orange fondant into carrot tops, about 1/8 in. (3 needed for each box). Using leaf green fondant, make 2 leaves per carrot. Attach leaves to tops of carrots using damp brush. Attach carrots to window boxes. Attach one box under each window.