how to add a user picture in version 7

Subscribing

you can use this

/**
 * @file
 * Template for relationships requests block
 * List all pending requests and provide links to the actions that can be taken on those requests
 */
if ($relationships) {
  $list = array();
  foreach ($relationships as $rtid => $relationship) {
    $tt_rel_name = ur_tt("user_relationships:rtid:$rtid:name", $relationship->name);
    $tt_rel_plural_name = ur_tt("user_relationships:rtid:$rtid:plural_name", $relationship->plural_name);
    if ($user->uid == $relationship->requester_id) {
      $relation_to =& $relationship->requestee;
      $usr = user_load($relationship->requestee_id);
      $picture = theme('image_style', array('style_name' => 'thumbnail', 'path' => !empty($usr->picture->uri) ? $usr->picture->uri : str_replace('/sites/default/files/','public://',variable_get('user_picture_default', ''))));   
      $controls = theme('user_relationships_pending_request_cancel_link', array('uid' => $account->uid, 'rid' => $relationship->rid));
      $line = t('@rel_name to !picture !username (!controls)', array('@rel_name' => $tt_rel_name, '!picture' => $picture, '!username' => theme('username', array('account' => $relation_to)), '!controls' => $controls));
      $key = t('Sent requests');
    }
    else {
      $relation_to =& $relationship->requester;
      $usr = user_load($relationship->requester_id);
      $picture = theme('image_style', array('style_name' => 'thumbnail', 'path' => !empty($usr->picture->uri) ? $usr->picture->uri : str_replace('/sites/default/files/','public://',variable_get('user_picture_default', '')))); 
      $controls =
        theme('user_relationships_pending_request_approve_link', array('uid' => $account->uid, 'rid' => $relationship->rid)).'|'.
        theme('user_relationships_pending_request_disapprove_link', array('uid' => $account->uid, 'rid' => $relationship->rid));
      $line = t('@rel_name from !picture !username (!controls)', array('@rel_name' => $tt_rel_name, '!picture' => $picture, '!username' => theme('username', array('account' => $relation_to)), '!controls' => $controls));
      $key = t('Received requests');
    }
    $list[$key][] = $line;
  }

  $output = array();
  foreach ($list as $title => $users) {
    $output[] = theme('item_list', array('items' => $users, 'title' => $title));
  }
}

print isset($output) ? implode('', $output) : t('No Pending Requests');

This may or may not have helped Charlie, but it did for me. So thanks for that.

What about on the normal user relationships page? Is that covered somewhere?

RKS for a normal relationships page there is a setting in the admin form.

Anyone up for creating a documentation page for this?

The imagecache integration is really bad. Here has some work tobe done. It's also missing in the pending requests block. So the easiest way is to code yourself what you need.