The color scheme in this design is very moody to coincide with the dark, horror-themed nature of the TV show. It is mainly shades of gray and black. Gray can be a gloomy color, but it is also associated with being timeless, which also works for Sleepy Hollow since it is also a show about characters out of time.
Black also prominent in the design. It has been associated with death, evil, mystery and strength, which are all associated with the Headless Horseman. Even the sign for the village of Sleepy Hollow is in black in the design, which is signifying danger to any who enter it.
The final color in the logo is red. It is used on the Headless Horseman’s red coat and the horse’s red, glowing eye. Without the color red, the design would be a little too dour. In the case of this design, red symbolizes war, danger, strength and power, which again, are all associated with the Headless Horseman.