If you want to create Wallpaper(Background) Slideshow, head over to -
http://gnome-look.org/content/show.php/ ... a0c12709bc
add the repository ppa:crebs/ppa to your sources list, update and install crebs.
Follow instructions from the website to create the slideshow, wallpapers can be found at -
/usr/share/wallpapers, drag and drop as required, root access not necessary. Save your slideshow with a suitable name.
Warning : the application is still a bit raw, eg. does not edit an existing slideshow, you have to save it with the same name after editing (saved slideshow will be at /home/user_name/.crebs/)
Enjoy.