Pixy is a freeware application which can automatically download and change wallpapers on Windows 7. Although Windows 7 has an in-build feature of changing wallpaper automatically after a predefined time, it cannot download from wallpaper websites. Pixy can automatically download wallpapers and then change them based on the time you have set.
The best feature of Pixy is that you can add search queries for your wallpaper and only those images which satisfy the search tags will be downloaded. You can also set the image parameters like scaling or centering, time interval change etc.
You can set the wallpaper type, image size, wallpaper style, color, etc. Pixy is a great tool for every novice and expert computer user.