It's really difficult to choose a wallpaper isn't it ? ;)
WallpaperSlide allows you to change your wallpaper at regular interval !

Wallr will enable you to randomly change the Android wallpaper based on a image directory defined by the user.

This version includes;
* Timed interval change
* Startup on reboot
* OnClick change option
* Path chooser

Default Path: /sdcard/Wallpapers