A cornice board valance as a window topper is a handsome addition to a window treatment, whether it covers a window shade, blind or draperies. It’s a decorative element that makes a window appear larger, and it can be a nice coverup for the top of ordinary hardware. It’s a relatively inexpensive detail that adds architectural interest to even the most basic window treatment. Type “wood cornices” in a search engine and you’ll find several online sources. When layering a cornice over a window treatment, make sure to measure its depth to order a cornice that will be deep enough to clear it. When measuring, order a cornice 1 inch wider than any outside mounted window treatment or molding that will be covered. At www.blindsonline.com, you’ll find a nice selection of wood cornices in different sizes. You’ll find them available unfinished, white, black and in several wood tone finishes. The cornice …