Here is a long, 16-foot, valance I made to frame a grouping of family room windows. This home's family room has a great view of a green belt and there is no need for privacy. The valance offers another texture to the room and brings the eye up to the colors in the fabric, making the room feel larger.
I added some layers of trim to the edge of the valance to give interest. The valance is a simple rectangle double the window width and hung with rings and clips from an iron rod.