WordPress introduces new HTML5 sandbox theme, calls out to CSS artists
Like the HTML4 'Sandbox' theme, this new theme, called Toolbox, is a semantic, clean-slate dream. You can leap right in and design a new theme just by modifying the CSS, while making the most of new HTML5 tags like article and header. Take a look at the Toolbox test site and, if you're a blogger, you'll certainly conjure up some cool custom creations. If you're already adept at the art of CSS artistry, you know what to do; and if you've never played with CSS, now's the time to learn!
WordPress.com users will need the Custom CSS Upgrade to make the most of the Toolbox theme, while self-hosted WordPress.org users can leap right in and install the Toolbox theme.