Boiler is a free responsive HTML5 boilerplate theme.
Fluid is a professional, elegant, vibrant, yet fairly simple corporate or business theme that uses varying shades of blue, silver, gray, and white with a semi-abstract water ripple header image that could be easily changed.
Spine is a white, grey, black, and blue two-column theme.
zeeNews is a theme for any news, magazine, or blog.
Just tried out the boiler theme – have to say I was quite disappointed though. I don’t think there is enough contrast between the font and dark background color making the text quite unreadable… it would have been great if it were easier to customize.