Antropov is a 3-column, light-colored theme built on the Cutline theme.
Brilliance is a 2-column theme with a very simple, clean layout and design.
Deadwood-lite is a 2-column, minimal theme primed for writers who want to focus their online efforts on readability, pull quotes, and clarity.
Dilectio is a 3-column theme with artistic stylings.
Hardcover is a 2-column theme with crisp design and typography.
Landis is a 2-column theme with two customizable options for the site title and tagline.
SparkWP is a 2-column, minimalistic, light-on-dark theme.
Webdesign is a 2-column theme with light-blue colors. (Download page is Dutch.)
Why walk alone? is a bright beachscape theme available in 2- and 3-column varieties.