HalfVast6 for Drupal 6.x – This theme, like a number of my Drupal themes, is derived from the classic Zen theme.  It is a variable-width theme with a green and gray color scheme.  It was originally built for a site that is still online, but is no longer being updated.  If you plan on using this theme for anything substantial, I recommend that you give the style.css file a good look as it needs some "dusting and cleaning."