After a hell of searches, I have come across the right theme, Gila. It perfectly matches what I wanted, three column design that uses 100% of the page width. Gila is really too cool. The only problem that I heard about it is that the pages that contain small post (where the middle column is smaller than the left or right columns) are not displayed properly in MSIE. But Firefox is displaying it fine. Otherwise, this theme looks solid. I am planning to use the same theme for rest of the pages and the Gallery 2 as well.