Is it all right to use two window treatments on one window?  What about different window treatments on different windows in the same room?  And should you mix and match your treatments across the house? With so many window treatment options, sometimes people want to mix and match them together.  But is it all right to layer multiple window treatments on one window, or is that style thought as tacky and gauche?  What about using different treatments on different windows in the same room?  And should every room use the same treatment to enhance cohesion and curb appeal?