Undertones of blue or green make it a cool color. For the most pleasing results, your curtain colors should be warm if your walls are a warm gray, and cool if the walls are more on the cool side.

Gray walls also hide stains far better than white walls ... If your walls have blue undertones, for example, blue curtains ...

I am not trying to outfit a ballroom in Monte Carlo), but these cheerful blue-and-white ... curtains in their living spaces, but I was able to convince (coerce) my boyfriend to get these upbeat ...