Drupal: Surface a block as a Display Suite Field

Drupal Display Suite

/**
*  Create a custom module and implement hook_ds_fields_info to surface your 'field' to DS
*  Create a custom theme function to create the content when called by DS
*
*
*/


function yourmodule_ds_fields_info($entity_type) {
  $fields = array(
    'yourmodule_group' => array(
      'title' => t('some desc Group'),
      'field_type' => DS_FIELD_TYPE_THEME,
      'properties' => array(
        'formatters' => array(
          'yourmodule_block' => t('Text'),

        ),
      ),
    ),
  );

  return array('node' => $fields);

}

function theme_yourmodule_block($variables) {

 // do some fancy stuff here
 $content = 'your field contents to return';

 return $content;

 }