Install GnomishDark theme on Ubuntu 12.04/11.10/Linux Mint 13/12 (GTK3 + Gnome Shell)

This is a clean dark theme for GTK3, based on Adwaita (provided by gnome-themes-standard), plus a matching GNOME-Shell theme. This theme works with Gnome shell, Gtk3.

You can use These Tools to change icons/themes: Gnome Tweak Tool, Ubuntu Tweak

Ubuntu Themes

Ubuntu Themes

1st Install nouveGnome Gray Icons then install theme.

To install GnomishDark theme on Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
Source: GnomishDark
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