Light Fantastic is a drupal 6 ready theme that also works well in Drupal 5.x platform. I am not sure about Drupal 4.x, if you have test this them under Drupal 4.x and it works, please leave a comment here.
The Light Fantastic was developed for the year 2007 Google Summer of Code. The result is an impressive Drupal theme that makes Drupal a pretty content management system that could challenge the mainstream news sites. It has dynamic-width design, which allows you to have two- or three-column layout, depending on your needs.
Download here: Light Fantastic Free Drupal Theme