The Gnome background can be set from the desktop with the right
mouse button menu. Choose Change Desktop Background.
Suppose you have a bunch of background images in
/home/share/backgrounds. The following command will randomly
choose one to display. You could put this as a cron job to run each
$ gconftool -t str -s /desktop/gnome/background/picture_filename \
"`find /home/share/backgrounds | random | tail -n 1`"
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