Keepsake quilting has a lot of repro fabrics that you could pick from. I would take off the blue and get a little fabric of the same era to complete it and make a pillow. If you just replaced the blue and then put it on muslin, it would make a lovely pillow. It wouldn't be tat difficult and not take a lot of time to do just one row. If the spots bother you, soak it in vinegar and water. It worked for me when I was given some very old Dresden Plate blocks. Most of the stains came right out.