Hello,
Thank you for your interest in vBulletin. For Pre-Sales questions and questions regarding the Admin Demo, you are better of by asking in a Sales Ticket by sending an email to
sales@vbulletin.com.
You can find more about the Style and Template system in our manual:
Styles & Templates
Templates are the building blocks for the layout, and are mostly in plain HTML. A set of templates form a Style.
There are many free and paid styles available, some of the free styles you can find in
vBulletin 3.6 Styles