Arched Window Treatments: ADJUST-A-VIEW Moveable Arches by Omega, Moveable Arch Window Treatment for Half and Quarter Circle Windows. Accommodates all leading brands of pleated cellular shades.
How to Cover Arches and Other Specialty Shape Windows
Redi Shade White Fabric Arch Window Shade - 72 in. W x 36 in. L 3155072HD - The Home Depot