Matt Mullenweg (the man behind Wordpress) says in a conversation:
The next version of Drupal is coming out with a pretty neat theme,
called Garland. Here's a demo page where you can customize it and save
This is pretty darn neat. Anyone interested in porting it? The toggle,
logo, and shortcut icon bits are probably superfluous, but the color
picking functionality is great.
As far as I know, this is the first time that a Drupal theme is ported to Wordpress. There is the feeling of some bad taste in the Drupal community about this port being done before Drupal was able to release this in Drupal 5 though. This still is a historical step in my opinion.