Here is a carnifex with interchangeable limbs, heads and backs
More pics here:
http://photobucket.com/albums/y78/Icklemek/Carnifex/
A tutorial on how I did it here:
http://tauonline.org/generalconvguides_carnifex.php
Enjoy.
Yeah, I was copying Marco Schultze's scheme. There is a darker grey between the black and the lighter grey edging which the photos have eliminated. And it was more of an edging than a highlighting.
And they need a bit of touching up, as well. I might go back and do that one day. I was more concerned with the modelling side than the painting side when I made it.