More WordPress Theme CustomizationsDepending on the theme you're using there might be additional options in that page. For example, the Twenty Fourteen theme allows you to modify its site title & background colors, add a background image and more. Once you're happy with the result, simply click on the Save & Publish button to save the changes.
Here you can modify your site title color and background color of your WordPress theme. So this is the best option you can get from the customization point of view.