I just added a Flickr badge to Generator.x using the excellent phpFlickr library. The code to retrieve the images from the Generator.x Flickr group is less than 20 lines. I turned it into a function and put inside a basic WP plugin shell, giving me a new API call for inserting into the sidebar.php template.

/*
Plugin Name: Generator.x Flickr utilities
Plugin URI: http://www.generatorx.no/
Description: Support utilities for Generator.x web
Version: 1.0
Author: Marius Watz
Author URI: http://www.generatorx.no/
*/

require_once("phpFlickr/phpFlickr.php");

function gxFlickrSidebar() {
  $f = new phpFlickr("API_KEY");
  $f->enableCache(
    "dbname",
    "mysql://username:password@host/dbname"
  );

  echo("<div class=\"gxflickrSidebar\">");
  echo("<div class=\"gxFlickrTitle\"><a href=
      \"http://flickr.com/groups/generatorx/\">".
      "» GX on Flickr:</a> Recent images</div>");

  // get photos using the Generator.x group's ID
  $photos = $f->groups_pools_getPhotos('59096658@N00', NULL, NULL, NULL, 12);

  foreach ((array)$photos['photo'] as $photo) {
    echo “<a href=http://www.flickr.com/photos/” . $photo['owner'] .
      “/” . $photo['id'] .”/in/pool-generatorx>”;
    echo “<img border=’0′ alt=’$photo[ownername]: $photo[title]‘ src=” .
      $f->buildPhotoURL($photo, “Square”) . “>”;
    echo “</a>”;
  }
  echo(”</div>”);
}

Once that’s done, all you need to do is insert the function call in your Wordpress template:

[..html..]
  if (is_home() || is_page()) {
    gxFlickrSidebar();
  }
[..html..]