There are 30 themes to choose--including Tree, Beach, Mountains and Ninja. To customize the Gmail inbox, users go to the "themes" tab under "settings." Users will find a variety of colors and patterns that change based on their ZIP code.
The nature themes change scenery over time, weather-driven themes that can rain on your mailbox, and fun characters to keep you in good company. There's even an old-school ascii theme (Terminal), which was the result of a bet between two engineers, according to the blog.--Laurie Sullivan