Orange-Black theme (Ubuntu) is a GTK theme.

Extract the archive and:
1) Move the folder Orange-Black to folder /home/user/.themes
2) Move the folder vagrale13 to folder /home/user/.icons
3) The folder images, has got the wallpaper,cups of compiz, and skydome picture.

Or you can do with the commands

1) Put the archive Theme.tar.gz to your /home/user
open terminal and

tar xvzf *.tar.gz
cp -r /home/user/Theme/theme/Orange-Black /home/user/.themes
cp -r /home/user/Theme/icon_theme/vagrale13 /home/user/.icons

user = your name

For more info, read the File README.

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”.