Set a (whole) page’s background colour on a per node basis. A Drupal 7 theme function that adds a class to the body tag.

Per node background colour. Drupal 7.

/*
 * Implements template_preprocess_html
 *
 * requires:
 *   the content type to have a List[text] field called 'field_bg_colour'
 *   using Display Suite the field may be Hidden but not Disabled
 */
function THEMENAME_preprocess_html(&$variables) {
  
  // if a background colour has been set within the node,
  // then set it as a class on the body tag
  $node = menu_get_object();
  if (!empty($node)) {
    $bg_colour = $node->field_bg_colour;
    $items = field_get_items('node', $node, 'field_bg_colour', $node->language);
    if (!empty($items)) {  
      $bg_colour_class = $items[0]['value'];
      $variables['classes_array'][] = $bg_colour_class;
    }
  }

}