Refreshed is a one column, white-spaced, and clean design with a lifestream feature outside the regular post stream. So your lifestream will not junks to any RSS reader.
RingBinder is a 2 column fixed-width, free WordPress theme, with righthand sidebar, enabled for widgets – the name is reasonably self-explanatory.
4 columns, widget ready, right sidebar, login menu at the header
Dark brown, two column theme
Three column, widget and gravatar ready, SEO optimized theme