Mine currently rotates every twenty or so minutes between 9,047 images; mostly minimalist designs, nature scenes, Star Wars images, Warhammer 40k images, space images, modern architecture, geology images, military hardware images, comic images, sci-fi images, maps, battle paintings, art, and gun images. It's pretty out-of-hand, and I add to the folder daily.

I may need help.

I do pare it down now and then when I see one I don't really like or one that's a bad resolution.

Currently, it is a TRON-esque neon green wireframe landscape against a black background.

As an aside, I never understood the mentality of putting images of scantily-clad or naked women up everywhere, be it posters, calendars, or desktops. Seems weird.