title: Change default file icon adding graphical label or similar to it, using Qt library
body: <p>I want do something like this:</p>
  
  <p><img src="https://i.stack.imgur.com/gehrH.png" alt="enter image description here"></p>
  
  <p>So, add label or graphical label to folders from Qt library, and I don't know what I have to do.</p>
  
  <p>I think, firstly I have to get/take default icon for element and then I suppose, I have to add the label (or PNG) to the icon, or similar, and finally show both.</p>
  
  <p>I'm doing a app similar to DropBox, and files inside a folder have this status label.</p>
  
  <p>Thanks in advance.</p>