about GNOME LOGIN SCREEN FEDORA 16

[Teddy Mutombo]

Hi Can Anybody please HELP ME PLEASEEEE
I was trying to change background of my Gnome login screen in FEDORA 16 
with this:
http://ask.fedoraproject.org/question/452/how-can-i-change-the-background-of-the-gnome-login

# su -
# su - gdm -s /bin/bash
-bash-4.2$ `dbus-launch | sed "s/^/export /"`
-bash-4.2$ GSETTINGS_BACKEND=dconf gsettings set 
org.gnome.desktop.background picture-uri 
"file:///usr/share/backgrounds/FILE.JPG"

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NOW I HAVE JUST AND UGLY BLUE BACKGROUND, HOW CAN I RESTORE MY VERNE 
BACKGROUND

Thank you very Much