I hopped over to my facebook just to have a 'quick' look and found a completely addicting fun thing. You plug in the names of who you want a collage with and it searches from the pictures that have been tagged with those names.
I did some of just me, some of Serg and I, some of Ris and I and some of the three of us. I just kept hitting 'retry' and it would come up with a new configuration.
Plus, it let me save them (some were very odd, those I didn't keep) - can't you just envision the scrapbooking opportunities?
It was a bit like having your life flash before your eyes!