Add the following to your template.php file, and you can add your own user-register.tpl.php and user-profile-edit.tpl.php files to your theme. For my purposes, I wanted to remove the form so I just added a paragraph to the tpl file and left it at that.
YOURTHEMENAME_theme(&existing, $type, $theme, $path){
return array(
'$hooks' => zen_theme($existing, $type, $theme, $path),
'user_register' => array(
'template' => 'user-register',
'arguments' => array('form' => NULL),
),
'user_profile_form' => array(
'template' => 'user-profile-edit',
'arguments' => array('form' => NULL),
),
);
}
I took some of the info from comments here and Drupal documentation here. Thanks!