From developer's page
A changing wallpaper for Linux (tested on Ubuntu 10.10 Maverick). Size is 1366x768 (my desktop)If you like this,please leave a comment for the developer.
-copy the file to a directory where it won't bother you
-extract the files
-inside a terminal, cd into the folder that was created with the new files
-run "sh ./install" (without the quotes)