Here you go, @banjo: Vertex-Maia-Light added in updated version 20170521-1
I hope it will work as expected also in Xfce. I haven't been able to test that, yet. This screenshot is with Cinnamon.
The package is only in unstable atm, but if you want to test you can install it directly with
sudo pacman -U https://repo.stdout.net/manjaro/unstable/community/x86_64/vertex-maia-themes-20170521-1-any.pkg.tar.xz