When I was making the Pleated Pouches pattern, I made a square bow for one of the large ones and it looks really sweet on the front!
It has a great vintage look and the lines of the bow are a nice reflection of the pleats.
I used the same fabric as the pouch, so the bow blends in some for just a subtle touch of cute.
The square bow is really easy to make and only takes a few minutes to sew. A quick tutorial for making a 4" wide x 1.5" high can be found here: