Iconic Mockup

Hey guys! So I'm working on a mockup for a site that I might make into a Wordpress theme eventually. Haven't decided yet. :) You can view the whole mockup here: http://cl.ly/image/3k0R273N1w3e. Something just seems missing. I'm definitely not the best designer, and I know that it probably needs some work, so I'd really love your comments and tips. Thanks guys!