Three column, fixed width, feature rich theme with support for Twitter and Flickr. The theme requires the user to follow some setup steps for optimum use.
Pink and white, two column, fixed width theme with rounded corners.
Circuit is a high-contrast, two column, typographically-driven theme for WordPress that is based on the Sandbox theme (so you need both of them).
Ark is an olive colored 2 column widget-ready WordPress theme
Four column theme with three sidebars – 1 widget-ready and 1 for Google Adsense.