GMail team has done it again. They have added new themes (30) to the current GMail themes which enables us to change themes as we logged in to GMail. In order to activate the new themes, click on the Lab icon next to your email accounts on the top right section and then click on the Themes tab. You will see lots of new themes which can be selected as your default theme.
The cool thing is that you can choose when to activate the themes based on your country and location. Currently, i used the Ninja theme, but i will try the other one too. Looking good now....
Update (08:53 AM): I have changed it into Tea House. It's very cute actually. Check the screenshot below.
Update (16:07 PM):It seems that they use dynamic images, because just now, my themes has changed. Look at the second screenshot.