Download Background Switcher, to rotate wallpapers with online and offline pictures
John’s Background Switcher changes the background image on your computer periodically.
You can specify pictures source from Individual pictures or folders on your computer; Flickr photo sharing – selecting pictures by person, tags, sets or just random; Phanfare web albums; smugmug photo galleries; Picasa Web Albums; Yahoo! image search;
JBS sits in your system tray and changes your background at the time interval of your choosing. You tell it where to get pictures from and how to show them – maybe you just want to see one photo at a time or maybe you’d like to see a ‘Snapshot Scrapbook‘ of photos thrown across your desktop.
You may also like to check this free Wallpaper Gadget