Although Cutline shines through its usage of Whitespace, many times one wants to add a background to a theme. Adding a background to Cutline is one of the easier things to do when it comes to modding, all you have to do is wrap the complete content container in a new div.
You need to edit your header.php and the footer.php for this and add the new container and background to the stylesheet of your theme.
Lets look at the recently released Cutline 1.1 Blue how you can add your favorite background.
Cutline 1.1 Blue has a gradient image as background, completed with the background color.