Abstract: A foam cornice board for hanging curtains including a foam body having a decorative front surface defining a flat central and decorative upper and lower portions. The central portion is configured to receive a flat strip of decorative material such as a single vertical blind panel. The foam body further includes a notch formed into its back surface along the upper edge for receiving a mounting member connected thereto. For longer spans, a decorative foam keystone connector panel joins two adjacent cornice boards together which are abutted in end-to-end fashion. A decorative foam side cascade with a coextensive side panel is connectable to a wall, the side cascade having an upper margin configured for mating supportive engagement with a lower margin of the cornice board.