Your wall hanging idea is a great one ... set them with some of that medium/dark blue that is in each of them
I've also seen old quilts re-made into stuffed 3-D Teddy Bears.
If you like the idea of framing ... how about skipping the glass? that should solve your fear about humidity and framing. I've seen old quilt sections and blocks nicely framed up in the four (or more) sectioned antique window frames.