Image imported from derpibooru
Original Description:

BFDI and BFDIA: A unicorn pony with a sharp mind and a talent for woodworking. Her coat could be a grey color, resembling a saw blade. Her mane and tail could be brown to resemble sawdust or wood shavings. Her cutie mark might feature a saw and a hammer.
IDFB, BFB and TPOT: A hardworking unicorn pony with a talent for construction and craftsmanship. Her coat could be a gainsboro color, reflecting her practical nature. Her mane and tail could be sepia and mauvelous to resemble saw blades or carpentry tools. Her cutie mark might feature a saw