title: Can paperclip be used for off-site attachments
body: <p>Basically, I want to import a number of URL of pictures from around the web and manage them in my app. I also let the user upload some files, and I use paperclip to manage the upload and generate thumbnails.</p>
  
  <p>My question is: can I use paperclip just to generate (and store) thumbnails for pictures whose originals are stored elsewhere (flickr, picasa, wherever)?</p>
  
  <p>If this isn't possible at all, what would be a good alternative?</p>