[agracier]

This is interesting. I just tried it out on a few maps, using some random blue colors. You do indeed get variations in the blue coloring, though I'd say it was just a slight variation in tones of blue.

When I tried making the water color something very dirtyish, something in the way of a gray/greenish/blueish North Atlantic ocean color for instance, I never got anywhere near the color I picked on a color picker ...

Is there a narrow range of blues available for water colors? Is it possible to get the water to a very dirty grayish/blue color?