I can only use one or two shaders on my Titan because the Armamentarium (exotic chest piece) won't change from its obnoxious shade of greenish yellow. Let us change the color!
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As far as I have seen all [i]exotics[/i] have an area that will not change color. Weather it be the color of the fish bowl on the warlock's helm, the center and back of both Alpha Lupi chest pieces or that purple line in St. 14's helmet. It would be nice if these colors changed, but it seems bungie wants exotics to look a specific way and not change with the whims of those using them.