Before I undercoat them, I just wanted to post some pictures of my Flesh Tearers Vanguard made with the Horus Heresy Mark IV armour set and a big old pile of spare melee weapons. I didn't have much of a plan going in, I just slapped things together however they best seemed to fit but I'm quite pleased with the results:
Okay, I'm not too sure what the chap with the power sword is meant to be doing. Exhorting his brothers to advance, perhaps? Regardless, I think they'll look fantastic as a unit (or two, depending on my needs), though that's probably more down to Maximus armour looking amazing than any of my input.
I also slapped together this little fellow out of spares...
… and some day he'll act as a colour test to see if I can apply the Angels Of Redemption colour scheme to power armour, which is a bit more complicated to halve than than Cataphractii Terminator plate that was my first experiment.