WallPapa is a free automatic wallpaper changer that change the wallpaper for you on windows start up or at time interval of your choice.
* Automatically change the wallpaper on start up or at time interval.
* Change the wallpaper manually via main window, tray menu,
or middle-click on the tray icon.
* Support various types of pictures: BMP, JPG, PNG, GIF.
* Five wallpaper style: CENTER, TILE, STRETCH, SCALE, COVER....