After making a bunch of box tops, I found this little armoire and decided to try a box DOOR...
...and I think it came out pretty well! I thought about replacing the smaller square as well, but I liked the effect of the roses side-by-side. The design is from Sam Hawkins' "501 Cross Stitch Patterns" book.
The stitched piece, with the backing, is a bit thicker than the glass that I removed, but the brackets still hold it in securely.