The Zukitre theme from Zuki-themes, but with a few tweaks. This contains just the GTK2/3 themes, without the GNOME-shell or Xfwm4 themes. To get the latest version, use the git repository on Github: https://github.com/dglava/zukitre-6699cc
Original Zukitre theme: https://github.com/lassekongo83/zuki-themes
All issues should be reported on the upstream Zuki-themes issue tracker, because I'm not maintaining this, apart from the few colour tweaks.
* #6699cc highlight color instead of #3399ff, Zukitwo's old highlight color
* Checkbox and radiobuttons are darker
* Window buttons have the same color (same as highlight color)
* Disabled images on buttons
* Changed notebook widget color to match the GTK3 theme