I made a quick list for Free CSS theme sites.
Here is the list;

http://www.freecsstemplates.org/css-templates/

http://www.free-css-templates.com/

http://www.freecsstemplates.org/

http://csscreme.com/freecsstemplates/

http://www.templatemo.com/

http://www.solucija.com/free-templates