There is a product called Bubble Jet Set that can be used to prepare your muslin so the photos won't wash out. After the muslin is prepared, cut it into squares and iron them onto freezer paper. Your fabric can then be run through an inkjet printer.
http://www.dharmatrading.com/html/eng/3446-AA.shtml
One other thing - don't suggest to your wife that the story of her life requires an antique look.
