heyas; latex, you might experiment in making the scale colour map a greyscale map (perhaps even the same as the bump map). you could then change the object colour to green/red/blue/brown etc, add the greyscale colour map to the base colour, and be able to switch easily. of course, if you make one colour that is all pretty much monochromatic; it's not big trick to change the hue in a painting app. :)