With the tool from here: http://translate.google.de/translate...1618d8&act=url
you can also replace standard screen saver pictures in \usr\share\system_manager\images
Here you can pick some ready to use images from my collection http://www.flickr.com/photos/booxtor
New screen_saver images must be renamed to screen_saver0.png, screen_saver1.png, screen_saver2.png, ..., screen_saver9.png. (no more than 10 images at once). May be it works with more than 10 pictures, but I did not figure out how.