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http://stackoverflow.com/questions/11064081/javascript-change-google-map-marker-color

https://medium.com/@barvysta/google-marker-api-lets-play-level-0-custom-marker-icon-8ce7efed9a38


More colors:
http://maps.google.com/mapfiles/ms/icons/green-dot.png
http://maps.google.com/mapfiles/ms/icons/yellow-dot.png
http://maps.google.com/mapfiles/ms/icons/pink-dot.png



<script>
  
	// create the markers for the two locations		
	var marker1 = new google.maps.Marker({
		map: map, 
		position: location1,
		title: "Start location",
		icon: 'http://maps.google.com/mapfiles/ms/icons/red-dot.png'
	});
	var marker2 = new google.maps.Marker({
		map: map, 
		position: location2,
		title: "End location",
		icon: 'http://maps.google.com/mapfiles/ms/icons/blue-dot.png'
	});  
  
  
</script>