Theming an admin form for the webforms module.

drupal-pardot-webform-theme-rendering.php

function theme_pardot_webform_components_form($form) {
  $form = $form['form'];
  $rows = array();
  $output = '';

  $header = array(t('Name'), t('Type'), t('Pardot key'));

  foreach (element_children($form['components']) as $k) {
    $row = array();

    // Name
    $row[] = $form['#node']->webform['components'][$k]['name'];

    // Type
    $row[] = $form['#node']->webform['components'][$k]['type'];

    // Pardot key
    unset($form['components'][$k]['key']['#title']);
    $row[] = drupal_render($form['components'][$k]['key']);

    $rows[] = $row;
  }

  $output .= drupal_render($form['details']);
  $output .= theme('table', array('header' => $header, 'rows' => $rows));
  $output .= drupal_render_children($form);

  return $output;
}