It downloads the files for you in a easy to use gui; The download process can take a while, depending on your speed, for example: If you select to download the backgrounds, it grabs over a 1000 backgrounds for you !!
But patience is rewarding, now you can easily select and setup a background from the thumbnails shown.
gnome-art is available in the universe repository;
sudo apt-get install gnome-art
gnome-art project is looking for a new maintainer!