Unzip Zukitwo theme to:
As lassekongo (author) say:
"..The /.themes folder is only for your user. If you for example open Synaptic or any other administrative application it will not be styled.."
And yeap, Zukitwo works ok in both gtk3 and gtk2
And one more thing.
Don't mix the two (or more) configuration tools: gconf-editor or mateconf-editor (if You use Mint Mate) with dconf-editor.
Dconf is old and incompatible app, since Ubuntu 10.04 time. Especially with Mate, Cinnamon, Xfce etc. A lot of settings causes errors in theme configuration.
The principle is generally such:
Mint Mate -> mateconf-editor +/or Ubuntu Tweak
Mint Gnome3, GS, Cinnamon etc. -> gconf-editor +/or Ubuntu Tweak +/or Gnome Tweak Tool.
Mint Xfce -> xfconf +/or Ubuntu Tweak...
This is just an example.
If You mix tools from different environments, system goes crazy.
Mint loads somehow "partially" his "theme configuration".
One config part from Mate settings, and another part from Gnome settings.
That has happened in the past on my system
In other words.. With a little patience, you can have effect like this - this is my desktop
https://plus.google.com/u/0/10710041428 ... qmrjHQ9aMj