Is there a way to get a stand-alone Tell a Friend page?
Tell-a-friend has been implemented for donation (including membership), participant, and pledge pages. 

I'm not quite sure how you want to use them. If you have a technology provider in-house or a CiviCRM consultant they could look over and adapt the Smarty template code at https://github.com/civicrm/civicrm-core/blob/master/templates/CRM/Friend/Form/Friend.tpl. See also the related php code at https://github.com/civicrm/civicrm-core/blob/master/CRM/Friend/Form/Friend.php, as well as the template at https://github.com/civicrm/civicrm-core/blob/master/templates/CRM/Friend/Friend.tpl and its similarly matching php code.