Wow ! google included variety of themes in gmail Setting:-
Hello Firends google Included collection of attractive themes in Gmail Setting so why you waiting check your gmail account and choose your theme from Gmail themes collection.
Please visit This LinK to Setup your Gmail Theme---->>>> Gmail Themes Collection
How to Apply New theme in Gmail Account---->>>>
* First Click in above giving link .
* When open themes collection page Double click in any theme which you want to apply.
* After few second theme will apply in your gmail account and you are done. CHEERS