It will change your wallpapers automatically, so you will be surprised whenever you close all windows and your wallpaper appears to your eyes. Choose as many pictures as you want. (it supports JPG, GIF, PNG, TIF and BMP) one by one or choosing a complete folder.
Set the intervals of time when the wallpaper will be changed, a certain picture to be shown at a certain hour, and more. Try it, it is free and it will make your wallpaper to be more fresh.