MahApps/MahApps.Metro — pull request #237 by Icehunter (2012-10-25 15:16:30+00:00)
Title: metro customizations

• added custom metro style groupbox
• changed tabitem header to have mouseover effect for greater clarity

I feel it looks nice :) You can see samples of what it looks like here (sans ToUppper):
https://plus.google.com/105953871212191878086/posts/bmvyaSQoWEb

With the TabItem (personal taste) it has a rollover background of the current color theme with white text, much like the groupbox header colors.