Mystique is a popular and free WordPress theme. It was being maintained by digitalnature since 2009. Mystique attemps to top free premium WordPress theme in terms of design and functionality.
- 6 layout types (each one can be context dependent)
- fluid or fixed page width
- 5 color variations
- bbPress 2.0 support
Currently it is only available in the Atom-powered version for extensive trough the dashboard and additional feature.
In my opinion, Mystique is very good for personal blog. It has fabulous interface and you can make your reader feel relax to read your content. You can place ads on your blog easily.