So, I had been painting World Eaters (the red dudes with the big helmets), then to keep my sanity I moved back onto my Iron Warriors (silver dudes with the hazard stripes) and now to keep my sanity I have been painting Death Guard.
Normally painted in a sickly green, I always loved their Heresy era armour. The lore is they kept their armour unpainted (the white is meant to represent the military decorum) however as they fell to chaos and then fled into the warp as the forces of chaos lost the heresy their armour became corrupted through nurgle. The new armour colour was a sickly green to represent the contagion they had.
Out of all the marines they show their corruption the most, with tumorous growths, tentacles and pustules. It makes them fun to paint.
So this scheme is more in keeping with the 30K version of the Death Guard. But the armour has been patinaed.
Chaos Marines are not beginner painter friendly yet also quite forgiving at the same time. Battle damage, patina and grime can cover a multitude of sins.
I still need to do some Thousand Sons and Emperors Children from the more unique Chaos Marines.