On a similar note, there's an app called "wallpaper changer" on Android. You can set multiple photo albums and enable all, some, or one at a time. It can change images automatically at whatever interval you specify.
I have about a thousand different Wallpapers from images I've taken offline and my personal albums. There's probably 200 images of "sexiness" and it's always a treat when a random sexy wallpaper pops up unexpectedly.
Give it a shot! Just be aware of your surroundings