Pictures from friends, family, work, and other people I know. They are leeched right off their memory cards, burned on a CD, emailed to me, downloaded from the company network, or downloaded from their picture sharing or personal sites.
Lots of Local soccer, Jobing.com Office / Staff, Jobing Mobile, Hawaii and Denver Pics.
All my galleries (some exceptions) are a mirror of my giant custom slideshow screensaver, which is run by Screen Paver. The selectivity of favorites relative to the complete horde is currently 1/4.5 (2/9, ~32/144) for this screen saver category.