Here is a test mini for an upcoming project. The idea was for a bone-coloured Cryx army with dark purple as a secondary colour. I recommended that the actual bones (like skulls and whatnot) be done a grey tone with thrall flesh as a highlight. The pink engine glow was his idea.
The little guy looks fine, but I think more purple is needed, just one more plate would have made it work better. Luckily, there are still three more bonejacks to work with.