Can anybody suggest any free responsive ecommerce themes in described style?

Hi,

Just wondered if anybody knew of any free, responsive themes that were- ecommerce compatible, have a large header,wide-ish,slider at the top of main page and then three areas in a row underneath for page summaries and widgets below that, top menu and easily customizable. Also would like, but not, a defining factor- dark grey background and all round theme throughout.

It seems there is a serious shortage in this type of theme with a large header! I have searched all week and there is nothing suitable.

Or if anyone could help me make twenty eleven theme like this i would appreciate it sooooooo much!

Thank you