I knew it! I knew it!!! :D lot of people saids Gmail is sooooooooooooooo pale!! I knew once Gmail implemented themes, the look and feel are gonna be awesome!!
Themes allow you to customize the look and feel of your Gmail account. To choose a theme, click a thumbnail on the Themes tab of your Settings page.
In some cases, you can also customize by location. Some themes change during the day, and we use the location information you provide to correctly time these changes with your local sunrise, sunset, and/or weather. If you select one of these themes, you'll see a Country/Region drop-down menu appear. Select the country you want, and then enter a city in the field provided. If you don't enter a city, or enter an invalid one, we'll set your location to the capital city of the country you selected. When you're done, click Save.
Note: Google developed most of the themes, but three were designed by external artists; Phantasea Renewal was designed by Matthew Ferreira, Summer Ocean by Jim Honeycutt, and Cherry Blossom by Vania Sofandi.