HackTrix.com has release PlusOne, a WordPress theme that looks exactly like Google+ interface. And the best is he releasing PlusOne WordPress theme for free.
I'm not tested this theme yet. But from the demo site it has a very clean and elegant interface with only use 3 main colors in its design but looks great, just like Google+.
Using PlusOne WordPress Theme
The author give some notes how to using this theme. He said that, to show the thumbnails on the theme, download and install get the image plugin, and set the default thumbnail size in WordPress to 100px by 100px. You can do this in media settings (Settings > Media).
You also NOT ALLOWED to remove the footer links. Please let's respect for his kindness to make this theme for free.
Download Google+ Template for WordPress Theme
Click on the links below to see the demo page and start download this theme:
Blogger User
For Blogger users, you can also download this theme by reading this post: Free Download Google+ Template for Blogger.
I agree with you, this is one great theme I've ever seen. thanks for this post!