Designers say a timeless treatment enhances the view without stealing the spotlight. Add layers for comfort, vary textures for interest, and let your personal style shine through. Trust your instinct when styling small or tricky spots and remember that a window treatment is meant to treat light, noise or temperature based on the needs of your space. · interior designers share six types of window treatments that make a room look tacky and should therefore be avoided. · below, were rounding up 14 items and looks that designers immediately deem as tacky when they walk into a home. We asked interior designers for expert advice on how to avoid their least favorite tacky decor mistakes—and offer pro tips on what to do instead. · common errors like picking the wrong rug size, furniture layout, color palette, window treatments , and more can wreck your home decor. If you desire a modern or casual home design, check out the one window treatment option you should avoid, as it can make any room look tacky.