Two Column Themes
Colourise is a two column theme which is made up of dark colors, it sports a gray colored text on a dark background. The theme comes built in with recents posts and comments listing in the footer area.
WP Brown is a two column widget ready page with valid XHTML and CSS. The theme is largely made up of brown colors.
Three Column Themes
Grunge Style is a three column theme with in built support for flickr, pagenavi support, custom field options, related posts and recent comments. The theme sports a wooden background with a grunge unique style.
Blue Jeans is a three column theme which is based on the popular denim. It sports the material in the background and also has trendy buttons in the sidebar headers. If you are a denim lover you will definitely like this.