Where should we begin? We can start theming by using any of these options:
Cloning the existing theme: We can clone the existing theme and give it a different name. Then update the theme.info file and other files such as template.php to correctly identify the new theme from Drupal. We can start the modification from there to fulfill our specific need.
Starting with an off-the-shelf theme: We can download an off-the-shelf theme from http://drupal.org/project/themes. Just download a theme that is close to what you need. Clone and modify it to fulfill your specific requirements such as changing the color scheme, fields, and so on.
Starting with a sub-theme or a starter theme: Some of the off-the-shelf starting themes provide ...
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