ScrollWall is a very simple tool by which your desktop wallpaper can be changed automatically after every fixed time interval in sec,minutes or hours. You can also set it to change the desktop wallpaper at every startup. The set of wallpapers can be selected by you , from your computer , and this set can be modified whenever you want. The fact that makes it better than other softwares in its category is the thumbnail view that it provide for the selected wallpapers and one click wallpaper change feature ie you can change your desktop wallpaper with just a click on the tray icon.So download and enjoy.