Drupal has a standard array of template suggestions that let you specify which TPL file should be used according to node type, node id, etc. However, there is no default template suggestion for pages generated by Panels.
You can easily fix that by adding a little snippet to your template.php files' preprocess_page() function.
You can also preprocess the the page for specific Panels layouts: layout; $body_classes = 'panel-layout-' . $layout; //add a body class for good measure $body_classes = 'page-panel'; } } } ?> And there you have it.