Wallpaper Slideshow Themes

For those who have a wallpaper slideshow themes, what is your theme? My current one, which I've have for the past four years, is slideshow of 2,000+ high-res artworks from major artists from western civilization, curated from Wikimedia Commons and elsewhere and meticulously cropped/edited. I really like it because it's educational, visually enriching, spans a large breadth of human history and geography, and I can always add to it, but I would really like to see what others like...