Paul Thurrott is reporting that a new feature in Windows 8 will be the ability to have aero elements automatically configure their colors.
To make this change, you visit the Personalization interface, which is basically unchanged since Windows 7, and then click Window Color. As you can see below, there’s a new option in the grid of window color swatches: Automatic. (Microsoft removed one of the brown colors to make room.) Click this and then click the Save changes button.
He has some example images..
Notice the border of the window taking the color of the screen background…