We also had a bear of a time finding matching gallery frames that we agreed on and would look right.  We finally settled on doing different frames, which actually turned out much better than I could have ever expected.  Basically, I love it and I think that we can carry the idea to the next place that we live as well.

If this is something that you want to do in your home, I would recommend using classic photos that have a meaning to you and your family.  We chose a mix of old family photos (grandparents weddings); classic family photos from when we were younger; and then photos from trips, with friends, and from our wedding.  Think outside of the box when it comes to finding the frames.  If you want all similar/matching frames, definitely check out West Elm and Etsy; both have more unique and different frames.  If you are looking for something more classic: Pottery Barn and Restoration Hardware.