13. Layer window treatments. One window treatment is good, but two is so, so much better! Not only do layers look more finished, but depending on the treatment chosen, they can also help control and filter the light. Here are three options for layering windows with style:Add crisp valances over curtains. Matching the fabric exactly is the easiest way to go, though you could add a decorative trim like grosgrain ribbon or nailheads. Pelmets, similar to valances, but made over a wooden frame, are more formal — great when you want to add a serious note to a modern room.Layer draperies over simple matchstick blinds for a look that is equal parts traditional and laid back.