title: Google Maps API Markerclusterer Plus set icon
body: <p>I'm making a google maps where the user can have an unlimited number of different categories on the map. I want to cluster each category in a differently colored cluster. </p>
  
  <p>So far I'm using the google maps <a href="https://developers.google.com/maps/documentation/javascript/examples/marker-symbol-custom" rel="nofollow">symbol</a> for the individual markers, and I want to create a symbol for the marker clusters as well. 
  From checking the <a href="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus/docs/reference.html" rel="nofollow">reference</a> of the marker clusterer plus. I see that it asks for image url - is there any way to use symbols instead?</p>
  
  <p>thanks!</p>