I’ve found these interesting themes which may be suitable for my projects I encountered.
- http://drupal.org/project/boldy
- http://drupal.org/project/adaptivetheme
- http://drupal.org/project/corporateclean
- http://drupal.org/project/journalcrunch
And, there are some major companies which have expertise in Drupal theme design I focused:
- http://www.siliconinfo.com/drupal-web-development-developer/detroit-metro-drupal-programmer-drupal-web-developer.html
- http://kaolti.com/
If anyone wants to find Drupal Theme, go to Drupal Themes and find what you want.