Making a Plywood Cornice Board
To create a fresh, timeless window treatment, and to hide the hardware, build a cornice board of plywood and mount it to the ceiling.
This cornice board enables you to add crown molding around the top of the entire room and gave the cornice board the look of having been built in. The cornice board should be painted the same tones as the walls, with a design of checks freehanded onto the surface with a foam brush. Connect the squares with circles applied with silver paint pens (a nickel was used for a template).
Cornice boards don't have to be painted -- they can be upholstered with fabric and batting or papered with wallpaper or wallpaper borders.
To bring soft, diffused light into the room, add pleated fabric shades. To tie the cords out of reach, attach a drawer knob to the window casing.