Windows: Whether you've already got a folder full of wallpaper or you'd like to find some new images for your desktop, Wallpaper Juggler can rotate and keep your backgrounds fresh.
Wallpaper Juggler is a small application that does two things: it rotates existing wallpaper in your wallpaper directory on a schedule of your choosing and it downloads new wallpaper from both Interfacelift — a winner in our Wallpaper-centred Hive Five — and Wallpaper Stock. Between the rotation of your already collected wallpaper and the infusion of new wallpaper in the size you specify from the aforementioned sites, you'll never have to stare at a bland desktop again.
Have a favourite tool for keeping your desktop fresh? Let's hear about it in the comments.