There's a button on Flickr that allows you to view icons of all the photos taken by other people that you've favorited over time. Above is mine. It's nice to look at a snapshot of stuff that's caught your eye... No rhyme or reason per se, but definitely an overarching theme. (Each of us have themes, of course.) But it's a pleasant feeling to look back at a collage of lots of images--favorited at random times on random days in random moods--and immediately think, yep, that feels about right.