Great site with the purpose to show off the power of CSS has to transform your website. There are a list of designs which you can select which change the look of the website. All content remains the same - the link merely substitutes one CSS sheet for another and re-renders the page.
The affects are astonishing. All HTML and CSS code may be downloaded so that you can study it.
The site owner is soliciting additional design studies, so if you are a CSS guru this would be a good way to show off for the crowd.