I usually create my own themes, but sometimes I'll edit an existing theme to save some time on the layout. http://freebosh.com
i love magazine themes and am so crazy about it. Infact i love collecting beautiful wordpress themes and i post them in my site http://top-best-themes.com
I'm currently using the theme "Motion" by 85Ideas.com, you can see it live here: http://interkiwiwebdevelopers.com/blog Code (markup):