If you are looking for a clean, well done WP Theme for a blog, take a look at these.
Top 7 Free WordPress Themes Released in February 2009 | 2experts Design - Web Design and Graphic Design Blog:
"If you are looking for free quality themes for your valued blog, here is a small but great collection of 7 free Wordpress Themes you maybe haven’t seen yet. All themes quality well designed elegance and an easy to use interface. I hope you Enjoy!"