soios/os/layers/participant/includes.chroot/etc/dconf/db/local.d/00-background

[org/gnome/desktop/background]
picture-uri = 'file:///usr/local/share/backgrounds/wallpaper-soi.svg'
picture-uri-dark = 'file:///usr/local/share/backgrounds/wallpaper-soi-dark.svg'
picture-options = 'zoom'
primary-color = '#e6e6e6'