Flavors is a minimal theme with many color and design options. By simply changing the background color it changes the other elements such as nav bar and side bar backgrounds.

You can also add a background image to give it more design. Check out the site below to see how this theme was customized further.

To change the background color simply add the following code to your Ads & Custom HTML head box in your admin section. Change the six digit hex code to you color of choice.