If you want to reduce the amount of light coming into your room, without shades or draperies, you can tint your windows or have the glass etched, with or without a pattern. This is an especially good treatment if your fan windows have interesting detail. You could also commission a glass artist to create a leaded glass. custom-designed. stained glass window to fit your decor or taste.
Also called "honeycomb" shades, cellular blinds are an excellent choice for arch fan windows because they softly filter the light, are insulating and come with select features. These blinds can go both top-down and bottom-up, which makes them adaptable to the shape of your windows. You can choose from a palette of about 50 colors. If you want, you can have them made with a remote control to adjust them to your needs.
You can make a fan of fabric that either matches or complements the window treatments of your other windows. On a curved rod, begin at the top center of the arch and swag the fabric to frame the window. You can continue the swagging to where it pleases you. A dramatic treatment is to install a curved, fabric-covered valance, following the lines of the arch, with draperies in a matching or contrasting fabric, hanging from the sides of the windows to pool on the floor.
Plantation-style shutters, made of wood or faux wood, are a classic solution for arched fan windows. These shutters are fashioned after the wide window slats found on old plantation homes to keep out the sun and the heat. Generally, the shutters are either natural wood colors or painted white. You have the option of continuing the look with plantation blinds covering the windows below or by installing custom draperies instead.