An orange and black one column theme, On Fire was recently released.
Several features might stand out to you. There is an RSS “feed” button on the top right, built into the title bar (and controlled via CSS), and there are feed links on individual articles, especially for comments. The “title” along the top, and in the index for each article, alters itself to whatever page is being viewed so it fits within the width of the theme.
Check it out at www.thex.com/rd/on-fire-theme/