The folks over at Good Basic have been doing a fine job of converting some of the brilliant templates available for various other CMS packages into Drupal templates. I have just committed, tagged for 4.6 release and created projects for the following new themes : Leaf, rdc*, Gespaa, Green Marinée and Blix.
As the projects have just been created, it might take a while for the packages to be available on Drupal.org, but they are already accessible from CVS. All of these templates require the PHPTemplate theme engine.