title: Python Folium MarkerCluster Color Customization
body: <p>I'm creating a leaflet map in folium using MarkerCluster. I have been all over the documentation and searched for examples, but I cannot figure out how to customize the color for a given MarkerCluster or FeatureGroup (e.g., one set in green rather than default blue).</p>
  
  <p>I tried creating the markers individually and iteratively adding them to the MarkerCluster, and that gave me the color I wanted, but then the iFrame html table woudn't function properly, and the popups were not appearing.</p>
  
  <p>The code I've written works flawlessly (an html table used for popups is not supplied), but I'd really like to be able to change the color for one set of markers and retain the popups using the methods in my code. Any guidance would be greatly appreciated!</p>
  
  <pre><code>or_map = folium.Map(location=OR_COORDINATES, zoom_start=8)
  
  res_popups, res_locations = [], []
  com_popups, com_locations = [], []
  for idx, row in geo.iterrows():
      if row['Type'] == 'Residential':
          res_locations.append([row['geometry'].y, row['geometry'].x])
          property_type = row['Type']
          property_name = row['Name']
          address = row['address']
          total_units = row['Total Unit']
          iframe = folium.IFrame(table(property_type, property_name, 
                                       address, total_units), width=width, 
                                       height=height)
          res_popups.append(iframe)
      else:
          com_locations.append([row['geometry'].y, row['geometry'].x])
          property_type = row['Type']
          property_name = row['Name']
          address = row['address']
          total_units = row['Total Unit']
          iframe = folium.IFrame(table(property_type, property_name, address, 
                                       total_units), width=width, 
                                       height=height)
          com_popups.append(iframe)
  
  
  r = folium.FeatureGroup(name='UCPM Residential Properties')
  r.add_child(MarkerCluster(locations=res_locations, popups=res_popups))
  or_map.add_child(r)
  
  c = folium.FeatureGroup(name='UCPM Commercial Properties')
  c.add_child(MarkerCluster(locations=com_locations, popups=com_popups))
  or_map.add_child(c)
  
  display(or_map)
  </code></pre>