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Wallch is an automatic wallpaper changer that works with GNOME 3 (and Unity). It features desktop/sound notifications, random image and time changing, live earth wallpaper (a 'live' picture of the earth updated every half hour), taking screenshots or webcam image.

The application also comes with Unity launcher support, so you can start or stop Wallch, select the next or previous wallpaper or start the live earth wallpaper from the Unity launcher:

Recently, the application got a new feature to automatically use a picture from Wikipedia of the day as wallpaper, as well as folder monitor and a redesigned UI. You also have an option to save the current picture of the day for later use.

To activate the picture of the day wallpaper or live earth wallpaper, firstly make sure the regular wallpaper changer is stopped (if started, click "Stop" in the main Wallch UI), then select Edit > Extras and you'll find a button to activate the live earth wallpaper or picture of the day. Here, you'll also find the folder monitor which adds any images you copy to a given folder to the Wallch wallpaper list.

Wallch live earth wallpaper

Install Wallch wallpaper changer in Ubuntu

The latest Wallch 3.0 is available in the Ubuntu 12.04 LTS repositories so to install Wallch, click the button below:

Or run the following command in a terminal:
sudo apt-get install wallch

Wallch is also available for Ubuntu 11.10 Oneiric Ocelot, but it's an older version. To add the Wallch PPA and install it in Ubuntu 11.10, use the commands below:
sudo add-apt-repository ppa:wallch/wallch-ppa
sudo apt-get update
sudo apt-get install wallch

For other Linux distributions, you can download the Wallch source from HERE.

thanks to Leon Vs for the tip!