Grunge
Grunge is a very fun theme for WordPress, nice pastel colors (green, blue and brown), widgets support, nested (threaded) comments support and JQuery Elements. It’s elegantly rebel!
Cartoon
Cartoon, as its name reveals, is a cartoon style WordPress theme. Very nice and fun design. Special for happy people. Has nested (threaded) comments support, custom widgets, Flickr and Twitter ready. Green and brown colors are the most visible.
Classifieds
Classifieds is a complete WordPress modification to create a Classifieds service. Includes all required plugins, very easy to install, PayPal ready and designed using blue over white color schema.