Run this command as root:
gconftool-2 --direct --config-source=xml::/etc/gconf/gconf.xml.vendor --set /desktop/gnome/background/picture_filename --type=string "/path/to/picture"
gconftool-2 --direct --config-source=xml::/etc/gconf/gconf.xml.vendor --set /desktop/gnome/background/picture_options --type=string "stretched"
Sourced from http://lizards.opensuse.org/2010/07/25/how-to-change-gdm-backgroundwallpaper/
Distribution Release: Gnoppix AI Linux 25_8
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The DistroWatch news feed is brought to you by TUXEDO COMPUTERS. Andreas
Mueller has announced the release of Gnoppix AI Linux 25_8, a major new
update of ...
13 hours ago