(My husband would say, "Yeah, someone please steal the rest of them right out of our attic.")
Matching the colors in the room, just select a different fabric for each pane (a couple of mine are quilted scraps). Hot glue or staple gun them on the back of the window, nice and tight.
It would even be cute with a curtain rod and valance above it if you had a big wall without a real window nearby.
*Just remember if you plan on sanding the original paint off of an old piece, there's a good chance it's lead paint so take the proper precautions.
More window ideas coming soon.