I just finished a new version of Green'N'Black theme for 5.x and also ported it to Drupal 6.x. This version will be available on Drupal.org soon.
Themes
New version of Green'N'Black theme released
Submitted by admin on Sat, 02/23/2008 - 18:59Added any-column layout (left, right, both or none), selected automatically. Code optimized and cleaned a bit, added few IE6 fixes.
Green'n'Black
Submitted by admin on Sat, 02/16/2008 - 20:00
This web 2.0 theme is built around a css-based (tableless) generic theme, which we use in every-day theme making routine.
The theme inherits its simplicity from legendary Drupal Blumarine, though it's built according to modern .css design patterns. It also has outstanding top and left side-bar menus.
You may contact us for paid theme modification and drupal-theming related jobs.

