An elegant and subtle theme based on the Photanical theme by Theron Parlin. Has a static header and a primary link bar.

Includes a 7 color switcher and a custom style sheet switcher versions.

From the site:

Impact is a free WordPress(1.5) theme - fast-loading, with a minimum of images and scope for customisation. The work has gone in to making it simple, both in appearance and code.

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.