I have a wordpress site that is already built. I need about 10 color schemes created with CSS. Then I need to have it programed with a session based on a query string. In other words if someone goes to http://www.website.com they get the default css if they go to http://www.wesite.com/?id=10 it creates a session that uses another css based on what that person choose, that info would be pulling from another sql database. 

Basically what is happening is people will be able to sign up for a "Free Website" which is basically a existing website that just has a different css with a different picture on the top header. Also they would be able to upload there image which would be displayed at the top of the site. This was already working before with a static html site but isn't anymore since the new wordpress was created.

This is the site: http://bonuscommissions.com/

You can watch the video to see what the end user has experienced.