No, I apologize there’s no feature in the theme to add a custom color. If you’re wanting to use a custom background image/color, you can do this though through Appearance > Background of your WordPress admin panel. Anything else beyond the options available in the theme would be customizations you’d need to make to the theme.
I’d think if you were wanting to change colors, an easier approach than actually trying to add them for selection would be just make CSS customizations to existing ones.
For CSS changes, it’s a good idea to use a tool like firebug or Google Chrome’s built-in developer tools to locate them and then put the edits either in your child theme or in the “Custom CSS” option on your theme options page.
Also, here’s a helpful tutorial on how to use Firebug – http://vimeo.com/20917974. The only thing I’d suggest not doing is actually making edits to the theme’s CSS files, as it shows at the end of that video. However, the video serves as a good introduction to Firebug and how it can be used to find what CSS is effecting certain areas of your site without ever digging around in any files.