Abstract: A simplified and light-weight cornice or valance system that can be manufactured along with a window covering in colors and patterns to match, shipped flat, and easily installed with the window covering is disclosed. The cornice or valance system may include a single-piece core with a foldable region near each end, the foldable regions defining a central non-foldable region and an end return non-foldable region at each end of the central non-foldable region; and an angle bracket for coupling to each side of a selected foldable region to retain a desired angle between the central non-foldable region and the respective end return non-foldable region.