A great idea for all your french doors. You could use it on your kitchen backdoor. Simple roll up under a flat valance in linen. Perfect idea for back door. You could also pair a piece of linen like a table runner or table cloth.
There are so many uses for shelf brackets! These are shelf brackets, repurposed to frame a window --- what a clever idea. You could do this to define and separate spaces in the same room, too. (Say an entryway and a dining room.