WordPress has become the most popular blogging platform in the world, not only because of easy to use, but WordPress is also easy to customize. You can even create your own themes for your blog, all functions are well documented on the WordPress Codex.
You also can find so many WordPress themes on the internet, every day the developers and designers releasing their works, there are premium themes, but many developers prefer to distribute their WordPress themes for free.
Here are some high quality WordPress theme
Under Creative Commons License: Attribution Non-Commercial Share Alike
1-Hipsterist
2-Obscure
3-Bureau
4-Zada News
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