One Column Theme
Grunge Superstar is a simple one column theme. The theme uses dark colors and you can add in additional information in the footer area.
Linquist is a simple one column theme which can be used to display portfolios. The theme comes in light and dark styles and has built-in lightbox and gravatar support.
Two Column Themes
Brightness is a magazine style 2 column widget-ready theme. You can control the layout of the theme using settings in the Admin Panel.
WP Pixels is a two column widget-ready theme. The home page has no sidebars and uses loops for three different categories.
Three Column Themes
Voodoo Empire is a three column widget ready theme. The theme makes use of dark colors. Both the sidebars are to the right of the content.
Elements of SEO is a 3 column widget-ready theme. The theme has two sidebars to the right of the content.