My mom just sent me this site. You can download software for free that lets you display photos as your wall paper and screen saver. They have tons of beautiful cat photos that you can download for free. I just downloaded so many pics and the kids and I have been watching them on the screen saver. Just thought I'd pass it along since the kitties were so cute (dogs and puppies too!).
http://www.webshots.com/homepage.html
http://www.webshots.com/homepage.html