Creating php/html pages on different accounts

Hi all,

Please excuse me if this has been posted somewhere as I could not find it. If there are other posts regarding the subject I would love to know about them.

Basically I would like to offer my hosting clients some special promotional pages that they can host on their own accounts. What I need the WHM system to do is physically create these pages on the clients own account.

Example:
Clients visits our company members area where they have the choice of using one or more pre-made promotional pages (could be a promotion for a hosting account). So they select the page they want, and then the software pulls their personal information (name, image, account) and uses this to create a promotional page on their own account.

Now I'm pretty sure we can create a software that will pull the clients details, but how would we go about creating a script that automatically creates a php/html page on that particular clients account?

Thanks for any help - much appreciated!

Nick