Abstract: Devices for covering the interior of windows include venetian blinds, shades, drapes, curtains and shutters. A simple decorative alternative to such devices is a system including a rectangular frame for mounting in or on a window frame, the rectangular frame containing partitions extending between the top and bottom or sides of the frame, both sides of the partitions and the inner sides of the top and bottom or sides of the frame containing recesses defining longitudinally and transversely extending tracks, in which are mounted a plurality of discrete panels. The panels can be slid longitudinally and transversely of the frame independently of each other for blocking selected portions of the window opening.