Last Wednesday, Gmail’s engineer Annie Chen said on official gmail blog about the new updates of inbox’s color and themes. Long time gmails’ user aspect that types of updates and also felt bored to see the same theme in everyday but gmail added some spice on your inbox.
Now from your settings go to theme tab and their you will get 31 different colors and themes and select anyone and it will works for your inbox and makes your gmail more attractive and you won’t get bored to see this new outlook. Enjoy.
Spice up your inbox with colors and themes [gmail blog]