I have written whole series related to Visual Studio 2012 features and this post will also be part of same series.You can get all my post related to visual studio from the following link.
Visual Studio 2012 feature series
Before some days I was searching something and found a great way to change the visual experience of visual studio 2012. I found that there are two type of themes available in visual studio 2012 light and dark under Tools->Option-> General environment value. This is one of newest feature I have found in visual studio 2012.