What is Windows 8 Aero Auto-Colorization:
A new feature has been revealed in Windows 8 build.
Aero Auto-Colorization is the new feature to automatically configure the color of Aero elements, like the Start Menu, Windows Explorer windows, and the taskbar based on the desktop wallpaper.
Now, as you rotate through different wallpapers, the window color will change to match the wallpaper (in Aero mode only).It is the feature introduced in Windows 8 build.
How to Get Windows 8 Aero Auto-Colorization Feature in Windows Vista and 7:
Now you can get the same functionality in Windows Vista and 7 using a freeware "Aura".
Aura is an excellent program developer by Stealth2010 which calculates average color of desktop background image or active window icon and sets it as Aero Glass color. It works like color hot-track in Windows 7 taskbar.
It works in Windows Vista and 7.