A general rule of thumb, is to decorate with colours that complement each other, as your window or door furnishings colour will ultimately set or reflect the overall colour fn a room.
When selecting a colour for your new furnishing, decide on the emphasis it is to place within your home or workplace, and ensure that it is able to tone in with the entire scheme of the area. The tone of a colour, is simply how light or dark that colour is.
Bright and rich colours will draw the eye and make the covering a coordinating feature or attraction. For the opposite, lighter and flat colours will blend the covering into the background and create an aspect of height.