title: Rails 3/ paperclip/ imagemagick - merging two images
body: <p>When a user uploads an image in my rails app imagemagick handles two transformations:</p>
  
  <pre><code> has_attached_file :photo, :styles =&gt; { :listsize =&gt; "50x50#", :articlesize =&gt; "300x300" },
  </code></pre>
  
  <p>a listsize (square 50x50px) image is produced. Is it possible to at this point merge this image with a standard transparent png that would make the image look more like an icon? (I have the png image, I just want to know if it's possible to render another photo style that has this default transparent png placed over the :listsize image). Thanks</p>