From Lunarpages Web Hosting Wiki
Does Lunarpages have website templates available?
Basic, Business, Starter, and Windows Plans
There are no free HTML scripts available through the control panel, but you can use most free templates that you find on the web. Many of the scripts in Softaculous and the Plesk Application Vault such as Wordpress, Joomla, OSCommerce, etc., have free templates/themes to change the look and feel of your site after you have installed them.