VeryVerySneaky metacity is a simple metacity that should blend well with any GTK theme.
# TO INSTALL #
1st. Download and unzip the contents of the .zip file to the /usr/share/themes/ folder
(you will need super user priviledges for this);
2nd. use the Gnome Tweak Tool (Gnome3) to select the Windows - Current Theme (choose VeryVerySneaky); or use the Appearance Settings of Gnome2 to choose the window borders.
Notice that gnome-shell will need to be restarted for the new window borders to appear.
For that, press Alt+F2, write r and hit enter (after Gnome 3.4, this step is not needed).
Assuming you have wget and unzip on your system, you may also try the following commands to install the theme:
sudo cp -r VeryVerySneaky/ /usr/share/themes/
rm -r VeryVerySneaky
For Gnome3, do the following additional steps:
1st. open gnome-tweak-tool
2nd. select VeryVerySneaky in the Themes - Window Theme option
3rd. Press Alt+F2, write r, and hit enter (after Gnome 3.4, this step is not needed).
For gnome2, go to the appearance settings and change the window borders of the current theme. No need to restart anything.
Feel free to change or improve the theme at your will. Constructive feedback is also welcomed.
The wallpapers used in the figure above can be found here [link]
and here [link]
The GTK themes used in the screenshots were MediterraneanLight and Adwaita Dark. The icons used are Nitrux OS Icons by DevianTN7k1, which can be found in [link]