Design two themes for dynamic Web site

We seek two innovative new CSS themes for a dynamic Web site that uses Javascript. Our non-profit organization has a set of dynamic Web sites presenting multiple subjects from a single database. Each subject requires its own CSS-based theme, including incidental artwork for backgrounds and borders as well as a banner and logo. The front end has been created and works, but we're looking for newer or better ways to display the same elements I need the CSS and Javascript elements of the site refined and documented so that additional themes can be created for the site. Then I would like two demonstration themes created using CSS. Here's page that has links to nine different subjects. You can see that they all share the same laytout but have different artwork. <[login to view URL]> We want to repurpose the same elements to create other layouts. The back end of the interface is essentially complete. This includes the PHP coding that delivers the appropriately html tagged data for different sections of the site. The front end currently has the required functionality. What it really needs is someone with HTML, CSS, and maybe some Javascript experience to experiment with it. The site has a whopping three pages, but we are open to new designs that use more (or less...) Please, only bidders with significant CSS/theme/design experience.