Found this awesome site/company called Image3D that make these old school view masters with all your own pictures in them. I remember having one of these when I was kid, but they had cartoon characters in them ; )
I went onto the site, and they're pretty reasonable - $25 for your first set, viewmaster and box (About R210)! I want to get one with our wedding pictures or maybe some pictures from one of our special overseas trips. I think it's quite a sweet thing to have, and could also make a really awesome gift.
I spotted these via this amazing road-trip themed wedding (it's only the styling, but I think there are some really nice ideas here if you're looking to do something a little bit different).