Clean Retina supports Custom Background Feature.
Go to Appearance->Header.
You can either set the image or color as background.
You can see the background preview on the same setting page.
Click on Save Changes.
NOTE:The background effect will only change the content part but not in the header and footer part. If you want the change to reflect in the header and footer as well then write your custom CSS in Appearance->Theme Options->Design Options->Custom CSS input field to hide the Header and Footer pattern. And Save the Changes.
Well this is what i want to do, change the color of the Header and Footer background. I have no experience with CSS and been searching the Internet and tried a quite a few different codes, wich did not work. So is it anyone who did that and would like to share the code with a newbie?
Otherwise it is a great theme, easy to work with and figure out how to do.