/usr/share/gnome-background-properties/ Current File: //usr/share/gnome-background-properties/desktop-backgrounds-default.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
<wallpapers>
    <wallpaper deleted="false">
        <name>CentOS Default Background</name>
        <filename>/usr/share/backgrounds/default.xml</filename>
        <options>zoom</options>
    </wallpaper>
</wallpapers>