Teen site designs

We need 3-6+ site design mockups for presentation to our client. These will not be the final product design. They need to be very different to show possible ways of doing the same site. The audience will be teens (15-21), so no kiddy stuff and not too professional. The subject/project is called Homework Helper. We have multi-media lessons, extended materials, further content, etc. Students pick by selecting their textbook, topic and lesson/pages. I have all the back-end (DB, AJAX, WAP, etc.) stuff working, but need to pitch the front-end UI, theme, marketing, approach, etc. for a super, popular and winning site. Needs to be good HTML (or PHP or into any Fantasico package) that I can quickly drop in my code and stage/deploy for viewing. Needs great stylesheets so I can edit during the demo/presentation. This project is going toward mobile WAP/WML, so extra thought needs to be put into layout. You need to be able to communicate and work with me, take criticism and do re-works. These web designs will lead to re-works, final project and possible phase 2 work. We also will have many future projects for the right candidate. Speed and quality are foremost. Show me examples of your work.