Colour is a design element that can be used to highlight or de-emphasize a feature in any given space. Since windows are a feature we usually want to accentuate don’t be afraid to add some panache. Using a complimentary or opposite colour will make the window a focal point but still blend into the surrounding décor. Conversely, using the same hue but varying its intensity (depth) will subtly blend the window into the rest of the colours in the space.
Consider larger finishes in the room such as flooring. Carpeting doesn’t change as often as paint colour does so it’s a good reference point to begin with when considering a colour palette. Remember; texture and pattern in the same colour family can add subtle ambiance to your windows also.
Let colour be your friend!