I very like Mageia gtk-themes Ia Ora, especially Ia Ora Night. But last few years I don't use GNOME, MATE and XFCE at all. I use LXDE and E17.
Ia Ora Night can be used as gtk-theme with LXDE, but LXDE use OpenBox as window manager. It mean that OB theme set looking of window border, window title, etc.
So, I created OpenBox theme which will look well with Ia Ora Night gtk theme in LXDE:
It is not a full copy (replica, clone) of Ia Ora Night border from GNOME-theme, but I think this new OpenBox theme will look well too with Ia Ora Night gtk-theme.
You can download compiled theme here:
http://box-look.org/content/show.php/Ia+Ora+Night+OpenBox?content=161018
Source:
https://bitbucket.org/xxblx/ia-ora-night-openbox
Have Fun.