Favoloso is a 3-column fluid theme, which is very light and features soft colors.
Vertical is a simple three column fixed width theme.
RockinBlue 2.0 is a Web 2.0-style, widget-ready, two-column, clean and sleek theme with BIG FONTS and easily changed graphical header, with Photoshop file included.
JD Sky 3C is a three column widget ready theme with the sky as the background.
Straightlaced is a two-column, clean, efficient looking theme that is ideal for the no-nonsense blogger.
WPTP2 is a 2 column theme with light colours and a striped black background.