This is pretty... maybe the walls for the "den" with the bookshelves, with a regular roof instead of a "greenhouse" roof.
Free plans to build a gorgeous reclaimed window and reclaimed wood Potting Bench! - A Piece Of Rainbow
Cabin built for $500 with re-purposed windows in the mountains of West Virginia (unsure how practical, but hey, it looks awesome)
Arched Architectural Reclaimed Window Mirrors
natural wood window sill …
this old window frame topped by a shelf would be great to frame a quilt scrap or black and white family photos
old windows/sheet music Perhaps with Hallelujah Chorus music sheets for Christmas? Add greenery and bows?
Reclaimed window chalkboard shelf by TKLdecor on Etsy
Reclaimed Window Coffee Side Table by dharmadesigned on Etsy, $375.00