“Fundamentally, the WordPress Theme system is a way to “skin” your weblog. Yet, it is more than just a “skin.” Skinning your site implies that only the design is changed. WordPress Themes can provide much more control over the look and presentation of the material on your website. ”
You can find more info about WordPress themes on WordPress Codex portal.
As an experienced WordPress developer I understand that you want a unique look for your website. That is why I am developing custom WordPress themes for all my clients that want new and modern design for their website in order to stands out from the masses.
My free custom WordPress theme, Topcat Lite is quite popular (more than 800 active installs in only 4 months).
If you want to attract more people to your website and need custom WordPress theme developed just for you contact me and I will be happy to help you.