just black & white
[{"featureType":"all","elementType":"labels","stylers":[{"visibility":"off"}]},{"featureType":"landscape","elementType":"all","stylers":[{"color":"#ffffff"}]},{"featureType":"poi","elementType":"all","stylers":[{"color":"#ffffff"}]},{"featureType":"road","elementType":"all","stylers":[{"color":"#000000"}]},{"featureType":"water","elementType":"all","stylers":[{"color":"#808080"}]}]