Practically every 16x2 display i've found is colored... blue, red, green, yellow, ...
But they are all less readable in sunlight especially when the back light is turned of...
Why cant i find the regular black on grey LCDs like you see in digital clocks etc. They are readable with ambient light.
http://www.winstar.com.tw/UserFiles/ProductImages/detail12768325700128991325.jpg