The choice of a theme for your blog is a very personal decision. The good news is that there are hundreds (perhaps thousands) of themes available to choose from ... this is perhaps also bad news is a way. It's all to easy to begin the search for a theme only to end up spends hours jumping for page to page, and site to site reviewing features, styles and layouts. May I offer the following post on Blogger Buzz as a starting point for your journey.

My personal Blogger template walkabout ended with the discover of the Mystique by Digital Nature. While the theme was originally developed for WordPress, it was converted to a Blogger them for WP Blogger Themes. There is a demo of the Mystique theme hosted on Blogger for your viewing pleasure.