Emire is a 2 column dark background theme.

From the site:

Emire is a theme which is just as comfortable in a commercial setting as it is on a personal site. Calm and aesthetically pleasing, Emire exudes an air of professionalism.

An elegant design with a split sidebar.

From the site:

This theme is meant to take advantage of the entire browser real estate available to it by making the sidebar utilize the remaining width. This makes it an especially interesting theme for blogs which have lots of content in the sidebar that expands horizontally.