All of elementary’s current offerings, combined with several external projects, come together to create one neat looking desktop. These include their icon set, eGTK theme and Nautilus improvements, as well as an interesting project called Gloobus Preview (a GNOME plugin based on Apple’s Quick Look) and Docky. Thanks to Ubuntu’s Personal Package Archive, installing components (or the entire elementary desktop) is a snap with the end result looking something like this.
Elementary Project