[ Thanks to Falko
Timme for this link. ]
“This article shows how you can change the appearance of your
Ubuntu 11.04 desktop (with the Ubuntu Classic interface, i.e.,
GNOME instead of Unity) so that it resembles a Mac. This can be
achieved with the help of Elementary, Docky, and Gloobus-Preview.
Elementary is a project that provides a popular icon set and GTK
theme; Docky is an interactive dock (like the one you know from a
Mac) that provides easy access to some of the files, folders, and
applications on your computer, and more; and Gloobus-Preview is an
extension for the Gnome Desktop Environment designed to enable a
full screen preview of any kind of file or directory.”