Wouldn’t a little tree with photos of ancestors be beautiful? Or you could put the ornaments on a full-sized tree in among the other ornaments. This is another conversation starter with the chance to share information about your family member.
Most photo printing places have custom ornament options. Below I have links for RiteAid and Walmart but there are lots more on the web.
If you would like a more hands on approach then the last two links below are a couple of craft ideas for making your own ornaments using photos. Your local craft store probably has more ideas or use your imagination and materials you have on hand to come up with your own creation.