“I was walking by a co-workers desk when I noticed he had Gmail open but it wasn’t like the usual Gmail look. He had something entirely different that made his Gmail account look really unique. How do you change the Gmail theme, is there a plug in i need to download?”
Google added different “Themes” in Gmail recently so everything you need to change your default Gmail theme is in your settings.
How to change Gmail theme:
Log into your Gmail account.
At the very top on the right hand side click on “Settings”
Now you should be in Settings with a number of different tabs, look all the way to the right and you will see the “Themes” tab. Click on it. Now you will see a number of different themes to choose from, click on any of the themes and Gmail will automatically change it to the one you selected.