Currently, there are 35 nice themes (including 4 new themes added on 3 Sep) for you to pick from, to dress up your gmail. The four new themes are Orcas Island, High Score, Turf and Random.
The fourth theme is a bit different from the rest of the themes. It is not actually a theme. By selecting the Random theme feature, your gmail will look different every day. Gmail will pick and display a random theme every day.
So every day when you check for email in your Gmail account, you will see different theme. The Random theme feature will cycle through all the available 34 themes (excluding random theme, of course!). To set random Gmail theme, from your Gmail account, go to “Settings”, then click on the “Themes” tab and select the “Random” theme option. Done!
If you hate to see the same old Gmail theme every time you log into your Gmail, select the “Random” theme and your Gmail inbox will look different every day.