Completely random. I was paralizing myself with indecision about should I do a yearly from birth, individual child, main high points, etc.
This one was a non digital photo. I have a lot of those from when the boys were tiny. DH wasn't letting me touch the new fancy camera then. Photosnob.
I used to go through the photos a lot, so I have a bunch memorized. When I see a swap set or a challenge that triggers a memorized one, I go searching for it. One of these days I will power sort all of them. But I'm not that ambitious yet.
I have outside bubble photos that I need to find for the set that Mickeyteacher made.