Wallpaper Changer is a simple wallpaper rotation tool for Android devices that automates your wallpaper rotation and offers a one-click widget to change it on the fly.

Wallpaper changing apps are common on desktop computers but noticeably less common on mobile devices. Wallpaper Changer brings rotation to Android devices in a battery friendly way; the application is optimized to minimize the impact on your battery life and even allows you to force it to only rotate when the phone is on an external power source.

You can specify the minute interval of the rotation and also set a home screen widget for one-tap rotation if you’d like a fresh wallpaper immediately. Wallpaper Changer is free, Android only.

Wallpaper Changer [Android Market via Addictive Tips]