The basic color pattern is quite fixed although the spot pattern on the thorax varies from individual to individual. The oolors of the antennal scales, uropods, raptorial appendages, etc, do not. The background boty color is somewhat variable from individual to individual and also varies with age and sex. Juveniles are somewhat more yellow. Females turn more olive to brownish green and males more bright green. However, as I have said before, you can be fooled. Diet, light, habitat and probably genetics can all effect color.
Roy