title: What icons are available to use when displaying a notification with libnotify?
body: <p>I'm using the <a href="http://roscidus.com/desktop/node/336" rel="noreferrer">libnotify</a> library to display a notification in Ubuntu. I would ideally like to display a battery of some sort (since my app is a battery meter).  </p>
  
  <p>The types of icons I can use are:</p>
  
  <ol>
  <li><p>a URI specifying the icon file name (e.g. file://path/to/my-icon.png)</p></li>
  <li><p>a 'stock' icon name. One that would succeed in a call to gtk_icontheme_lookup() (e.g. 'stock-delete') Note: these are not necessarily normal GTK stock icons - any theme icon will work.</p></li>
  <li><p>a pixbuf</p></li>
  </ol>
  
  <p>I would ideally like to use option #2, however I can't find out the names of the available icons. How can I find which icons are available? </p>