Sometimes it’s difficult to choose a theme for your blog.  Themes often control more than just the look of the blog; they can also change the navigation, arrangement, and add additional features.  Furthermore, some themes are rich in features and are like several themes in one, while other themes are very basic and have virtually no appearance options.

[youtube]http://www.youtube.com/watch?v=TpfbkfGcDRI[/youtube]