Google Maps API Tutorial© 2007, 2007, 2009 Mike Williams
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Toned map - New methodYou can now change the colour tone of a map by overlaying partially opaque GPolygons over the map.
Things go slightly askew if you try to use a single polygon for the whole 360 degrees of longitude. Four polygons that span 90 degrees each works.
Things can also go wrong when a polygon crosses the International Date Line, but you can have one polygon that ends at 180 degrees and the next polygon starts at 180.000001.
Here's an example
RestrictionPolygons don't wrap round the Earth. If you zoom out so that more than one copy of the Earth is visible, then only one copy of the Earth will be toned.