More to explore:
no sew - Arch Window Cover... using cardboard
Extended arch window treatment
cover idea for arched window
Arch window solution TUTORIAL. Might work.
window coverings & faux wall with stencil - i love this idea for my bathroom window, style, not necessarily print
Arched Window Covering
Covering Arched Windows, how to cover arched windows with a cost effective shade...under $6!! Theraggedwren.blo...
Window dressing. Finally found a cheap way to cover this arch! Styrofoam covered with fabric.
a little sparkle: My $4 Window Covering
Covering Arched Windows, how to use paper shades to cover windows Theraggedwren.blo...
bedroom window coverings - Google Search
I'll Try Any Pin Once: Covering an Arch Window using poster foam board, cut and cover with fabric. super easy installation: prop up in window on ledge
DIY....window covering for arch window for less that $20
Maybe? Fabric Covered Foam for an arched window.
Cost effective way to cover an arched window: Cut cardboard or another opaque material to size and paint it white then cover with a Ready Arch paper shade. Blocks light, insulates and costs a fraction of custom shutters or blinds.
@Kacie Brown Okay, change the colors and use your imagination a bit, but the idea of this could work to cover your window arch...