CSWall is a free tool for downloading images from and setting them as your desktop wallpaper

You're able to choose the types of pictures you prefer from one or more of 28 categories: Nature, Animals, Landscape and Travel; Concert, Wedding, People and Cities; Abstract, Fine Art and Macro, or any combination you like.

You can update your wallpaper on demand by clicking a "Change" button, or automatically at a specified interval.

The web address of the current image is displayed, and there's a "Save Image" option to download it locally.

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CSWall is an easy-to-use wallpaper-changer, and the images are great, but it's more designed as an on-demand application than an automated switcher. There's no built-in option to set it to launch on startup, for instance, and it didn't even remember our preferred image categories when we closed and restarted the program-- we had to choose them again.