I've recently finished both of the remaining Machine Wraiths for my Cryx army. For 1 point each, they make great scenario models to screw with my opponents! They were much faster to paint than I expected and I'm pretty happy with how they turned out.
My Machine Wraiths are now green, purple, and grey to tell them apart on the table. The purple is probably my favorite due to how well the purple looks on the model.