You have the option to chose 10 color styles which can be setup through the Classipress admin settings.
In order to do your customized color style, you need to edit some codes and knowledge in php, css, html and etc will come handy for this kind of modification. Take note the official support only covers the default theme configuration and customization is not.
Please help our moderating team work more efficiently by not sending us support questions via PM. You can read more about how AppThemes support works
here. However, you can send a PM to follow up and remind me if I missed your support request/thread.
Thank you and have a nice day.