ymaps.clusterer

      var customIconLayout = ymaps.templateLayoutFactory.createClass('<div class="point_cluster"><img src="src/to/image.png" />{% include options.clusterIconContentLayout %}</div>');

      var customIcon = ymaps.templateLayoutFactory.createClass('<div class="counter">{{ properties.geoObjects.length }}</div>');

      var clusterer = new ymaps.Clusterer({

        clusterDisableClickZoom: true,

        clusterOpenBalloonOnClick: true,

        clusterBalloonPanelMaxMapArea: 0,

        clusterBalloonMinWidth: 310,

        clusterBalloonMinWidth: 310,

        clusterBalloonContentLayout: customBalloonContentLayout,

        clusterIconLayout: customIconLayout,

        clusterIconContentLayout: customIcon

      });