Finally the first ever theme for windows 7 is out at deviantart.com by a user alkhan, recently we had written about how to apply custom themes in windows 7 by patching Uxtheme.dll and some other system files of windows 7.
This first ever custom windows 7 theme based on aero diamond also got its name as Aero Diamond Theme for Windows 7. This theme is slightly change to the windows seven theme for vista.
(Image Credit Goes To alkhan)
This theme introduces completely transparent effects like aero in windows 7 with some changes and UI tweaks in explorer in win 7.