'A Block' is a one column layout (that's right, no sidebar here) theme.
It is more of an experiment than a real theme as it goes a bit away from the way drupal is intended to work. I have few projects for this theme, like including collapsible blocks for example, support the color module. It needs a lot of testing right now, and I am open to any suggestion.
ADDED COLOR MODULE SUPPORT, it is now possible to change some of the colors of the theme using the color module.