With this minor change in app/views/shared/_flickr.rhtml the flickr images also link to their source image on flickr.

- <div><%= image_tag pic.thumb, :alt => pic.title %></div>

+ <div><%= link_to image_tag(pic.thumb, :alt => pic.title),pic.link %></div>

Also add the following to the stylesheet so that their aren't weird link borders under the images.

#flickr a { border: none; }

#flickr a:hover { border: none; }