, , : http://rbrundritt.wordpress.com/2009/11/27/bing-maps-custom-tile-skinner/
ColorMatrix ColorMap:
The two key methods used to transform the colors
consist of using ColorMatrix or a ColorMap. By
using a color matrix all the colors on the tile
can be changed within a couple lines of code. Using
a ColorMap allows you to change one color at a
time. This is useful if you only want to change a
few colors on the map.