Elementary OS X 0.1 by Jamie Greenland
Contains an Emerald theme and a Chrome/Chromium theme.
Emerald Theme 0.1 //
To install the Emerald theme you must have Emerald Themer installed which can be found in the Ubuntu Software Center. The easiest way to enable the Emerald theme is to install Compiz Fusion Icon, also found in the Ubuntu Software Center, and select Compiz as the Window Manager. To keep this setting you can add "fusion-icon" (without quotes) to your Start-Up Applications. Alternatively you can just type "emerald --replace" (without quotes) into Terminal which will enable Emerald for that session.
The Emerald Theme is optimised for the Elementary EM GTK theme: [link]
However you can easily change the colours using the Emerald Themer to better suit your current theme, or you could change the window colour of your current skin in Appearance and selecting Customize.
Google Chrome Theme 0.1 //
To install the Google Chrome theme simply open the elementary osx chrome.crx file in Chrome/Chromium and the skin should install.
For the future //
I am currently working on a GTK theme based on the original Elementary theme which will, hopefully, more closely resemble OS X however with a slight Elementary-ness to it. Note that I will not be creating an icon theme as I simply don't have the time.
Please report any bugs or post any suggestions here.