This metacity theme fits better (in my opinion) with dark gtk themes. Like in Adwaita, all its elements (including buttons) are direcly drawn in the xml file (i.e., the theme is composed by a single metacity-1.xml file).
To install, just download the .zip file, uncompress it and copy the contents to /share/themes/. After that, the DarkUglyCase theme should appear as an option on the gnome-tweak-tool (tab Theme->Window Theme).
To install using the terminal, consider the following commands:
sudo cp -r DarkUglyCase/ /usr/share/themes/
rm -r DarkUglyCase/
After choosing the metacity theme on gnome-tweak-tool, one has to restart gnome-shell. This can be done by issuing
write 'r' on the dialog and
Please note that I only tested the theme on Gnome3, but it should work on Gnome2 also. The theme should then appear as an option for the windows on the appearances settings of Gnome2.
Hope you enjoy it.
The wallpaper I am using is from hyperdude111 and it is available in [link]
Details on the gtk3 and gnome-shell themes used in the screenshot can be found in the following link (except for Zukitwo): [link]
Zukitwo is by lassekongo83 and can be found in [link]