Something old is new again. The Blue_mark theme for Drupal 4.7 is available at CMS Report. The Blue_mark theme uses Drupal 4.7's default theming engine, PHPTemplate. This theme is released under the GPL.
The Blue_mark theme was originally offered by Charles Lowe and available for download at his site, cyberdash.com. The original theme was written for Drupal 4.4's Xtemplate theme engine. I maintained the theme through Drupal 4.6 for a personal site of mine. With the switchover to the PHPTemplate theme engine as the Drupal 4.7 defualt, significant work was needed to keep old Blue_mark alive. The Blue Marine theme was used as a starting point. Minor tweaks were made to Blue Marine's PHP files and significant changes were made in the CSS.