Ubuntu Guide posted a tutorial about installing Elementary Gtk 2.1 theme(Murrine Engine& Nautilus Elementary) in Ubuntu

DanRabbit has released Elementary Gtk Theme 2.1 version on 3/5/11 with following new features. Here is how to install Elementary gtk 2.1 in Ubuntu include required Murrine Engine and highly recommended Nautilus Elementary.

New Features:
+ dropped Aurora engine
+ new xfwm4 theme
+ works with GTK 3
+ misc bug fixes
+ dark by default

  Install Elementary Gtk 2.1 theme(Murrine Engine& Nautilus Elementary) in Ubuntu