The recolor function works as a hue-shift. Black, white, and greys have no hue to shift so they stay the same. GT3 OS looks to be basically black and grey so it won't shift, other than the few colored parts Wizard is talking about. On these blinds you can "recolor" them if you want to some degree by applying a "Texture" (4th tab on the bottom of the WB Config window) with "Use texture color" checked (checkbox in the lower left corner of the "Textures" screen). The texture colors are overlays instead of hue-shifts. The texture color kind of needs a little grey to "grab onto" though, it doesn't work particularly well with extreme black or extreme white.
