I've got about 400 personally hand-picked wallpapers of beautiful girls, mostly models and actresses. The wallpaper changes automatically every half an hour.
I used to have well over a thousand such pictures when I had a 1024x768 resolution. And about 800 when I had 1680x1050. Now I have 1920x1080, and hold even higher standards than ever before. Even though they've always been rather high.
Here's a couple examples (desktop icons taken out from view):
<spoiler=one>
<spoiler=two>
<spoiler=three>
<spoiler=four>
<spoiler=The Current One>