Ambiance DS Blue is a mix of several other GTK themes.
Developer comments
The main portion is based on Ambiance Dark Sidebar theme by Warriorlng64 (http://www.webupd8.org/2011/11/download-ambiance-with-dark-nautilus-3.html), with slightly darker bg_color, blue highlight instead of orange and flat toolbar among several other changes.
I also use gtk2 panel graphics and panel.rc from Zukitwo (by lassekongo83) mainly for xfce4-panel theming.
I have replaced the window decoration with theme from Hope GTK3 theme and removed the unity window decoration.
How to install?
http://news.softpedia.com/news/How-to-Install-GNOME-Themes-in-Ubuntu-11-10-231213.shtml
About GNOME:
GNOME is an international effort to build a complete desktop environment—the graphical user interface which sits on top of a computer operating system—entirely from free software. This goal includes creating software development frameworks, selecting application software for the desktop, and working on the programs which manage application launching, file handling, and window and task management.
GNOME is part of the GNU Project and can be used with various Unix-like operating systems, most notably Linux, and as part of Java Desktop System in Solaris.
The name originally stood for GNU Network Object Model Environment, though this acronym is deprecated. The GNOME project puts heavy emphasis on simplicity, usability, and making things “just work”.
Product's homepage
Requirements:
· GNOME
· GTK+
What's New in This Release: [ read full changelog ]
· Changed panel.rc file and added missing .png files from SLAVE GTK3 theme. Minor tweak to gtk-3.0 settings.ini.