https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-blue.png
https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-green.png
https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-grey.png
https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-red.png
https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-violet.png