Different themes for different pages / users

Hi all,

I searched the forums but couldn’t really find anything quite like this.

This is what I’m looking for: my family is moving to Beijing. To keep our family and friends updated on our experiences there, we want to create a weblog. We are with four people. The main page will include our blog postings, all posts from everyone will appear on the frontpage.

I want to make some subpages for every family member. I want those subpages to have a different theme. The base of all themes is the same, but I want to use different CSS colors and background images to give each family member it’s personal look on the site. I also want to list just the stories of this one person on this site.

Does anyone know how I can make this happen?
Kind regards,
Casper