How to Theme Your Drupal Module - buildamodule.com

Integrating the Drupal theme layer into your module can be a confusing task, and if you're new to Drupal you might not even know what that means. For one, theming allows other developers and designers to override the look and feel of your module with hacking into your code, but that's only part of it. After watching this video, you'll be more than comfortable with them idea of theming, and how to integrate theme functions and files with your module.