CodeCanyon - Email Customizer for WooCommerce v2.22
Email Customizer enables full customization of your WooCommerce emails. Customize colors, header and footer format, add custom links, link to your social networks, and customize what the email says - with [shortcodes] - all using the familiar WordPress Customizer interface. You no longer need to be a developer to do this. And if you still want to you can add your own custom css too.