View Options tab arms you with the vest scope of options on how you can change the color theme of your website. You can not only change the main color theme of your website but also change the page layout. You have three options for this purpose.
Clean layout allows you to set clean plane layout that will suit perfectly for the business or corporate websites. Color and pattern image will be applied for the footer section only.
Boxed layout allows you to change page layout and place background color behind the page with the pattern image, that will go above the background color but behind the page.
Full background image should be used in case you want to set background image and set color for the footer section along with the pattern image if needed.