My warmachine army of choice is Menoth. The extreme religious stance is something that interests me much. Therefore I would like to have a crusader theme going through them. And being all nice and bright just didn't seem to fit with the dark and brooding background normally associated with a overzealous and crusading army.
The main issue I had with warmachine was that there seemed to be a "fixed" color scheme for each army. And when we see alternate color schemes applied in warmachine armies most of the time it would feel "wrong".
Even as I embarked upon my slightly different colored Menoth warjack I did not really feel comfortable. But I have to admit after looking at it for awhile longer I began to "warm up" to the color scheme.
I wanted a darker scheme to the Menoth army. But Menoth tended to look good with whites and bright colors. I saw a couple of very dark painted Menoth minis and it just didn't quite kick it.
Therefore I decided on white as a base, as normal. But swapped out all the purple and bright colors with black.
This resulted in a single black and white color scheme which I feel retains the bright mainstay of the Menoth look while subtly adding that dimension of darkness to it.