var LeafIcon = L.Icon.extend({
options: {
    iconSize:     [38, 95],
    shadowSize:   [50, 64],
    iconAnchor:   [22, 94],
    popupAnchor:  [-3, -10]
    }
});

var greenIcon = new LeafIcon({iconUrl: 'http://leafletjs.com/docs/images/leaf-green.png'}),
redIcon = new LeafIcon({iconUrl: 'http://leafletjs.com/docs/images/leaf-red.png'}),
orangeIcon = new LeafIcon({iconUrl: 'http://leafletjs.com/docs/images/leaf-orange.png'});


L.marker([51.5, -0.071], {icon: greenIcon}).bindPopup("<p>ok</p><p>tada</p>.").addTo(map);
L.marker([51.5, -0.073], {icon: redIcon}).bindPopup("I am a red leaf.").addTo(map);
L.marker([51.5, -0.076], {icon: orangeIcon}).bindPopup("I am an orange leaf.").addTo(map);