iLinux-theme is an open source GTK3 theme inspired by Apple's iOS mobile operating system. It is compatible with GTK 3.6 and Ubuntu 12.10. The icon set is called ilinux-icons.

For detailed installation instructions please see the following tutorial created by Softpedia: http://news.softpedia.com/news/How-to-Install-GNOME-Themes-in-Ubuntu-11-10-231213.shtml