Abstract: A modular window shade assembly has two embodiments. One includes a frame with a generally arcuate opening containing a blind system with horizontal slats that may be pivoted to control transmission of light through the opening. In the other embodiment, an arcuate portion contains a fixed fan shade within the arcuate opening. In each of the embodiments, the frame is sized and configured to fit within an existing window opening juxtaposed to the window for easy assembly. A decorative molding is provided to be installed within the inner walls of the existing window frame to provide an aesthetic appearance in front of the shade assembly as installed.