Elegant Themes provides a great selection of quality WordPress themes that you can have access to by purchasing a yearly subscription at a very reasonable price: $19,95 as of September 2009.
UPDATE: As of July 2012, you can get 100% complete access to our entire Elegant Themes collection of 77 themes for only $39! That’s less than 50c per theme.
Here is what the owner of Elegant Themes states:
I craft my themes with a goal of simplicity and professionalism and strive to inject each design with a dose of modest elegance. I believe that your website is not just a tool, it is an integral part of your identity. My job is to respect each customer by providing attractive and userfriendly templates that will help you achieve your online goals.
Each WordPress theme comes expertly coded in valid XHTML and CSS, and all are made compatible with the latest version of WordPress. I make sure that each template performs flawlessly in each of the most widely used browsers to insure maximum functionality. Furthermore, all sidebars are made widget ready for your convenience.
If you are looking to give your blog a new and unique look make sure to check out Elegant Themes.