Fedora 24 background is unsuitable

For the upgrade feature the designers [sensibly] want me to use the default background for the release we're upgrading to. When doing F23->F24 this makes the upgrade UI look like a big boring black square: http://imgur.com/dRY5iL6 Additionally, when upgraded, the darkness makes the GNOME Shell top bar almost disappear visually which really doesn't work at all given the special status it has. Is there any way we can either: * Lighten up the background we have now so it's less black and soul-consuming * Choose another background we can use for all spins * Just use the existing awesome upstream GNOME artwork for the workstation We already brand the workstation spin with the fedora background logo on the wallpaper, in GDM, in the control center and in various other places so I'm really confused why we've gone back to the days where we needed to replace the background every cycle for all desktops when we really only have one official workstation product. Richard