Visual Appearence fine tunes the colour and glass style.
To do this:-
Right click on a blank area of desktop and select Personalize.Now from the lists present under the Personalize appearence and sound effects choose Visual Appearnce.
Now there are eight colours you can select any one from them.These are:-
Aero;Frost;Smoke;Seafoam;Heritage;Sky,Heart and Candy.
You can change the Intensity by sliding the scale as well as the Color,Saturation and Brightness.