Gmail has rolled out some kewl new themes and I just love the new Android **theme. You can set it by clicking on **Settings -> Themes -> Android in your Gmail account. This is how it looks like:
Also, if you love Google Chrome Web Browser just as much as I do, then you can use a similar theme called Robot Theme for Chrome This is how the combo would look like:
PS: The Robot theme for Chrome was introduced to me by my friend, Venkata Aditya Korada.