To make this guy I start with a pair of Mark VI Assault Marine legs. The torso and shoulder pads come from Forgeworld's Raven Guard upgrade pack. The lightning claws are bits from an Assault Terminator Sergeant. The jump pack is from the Blood Angels Sanguinary Guard kit, and the jump pack wings are from Astorath the Grim.
So I wanted to see if I could achieve something similar. I painted the wings and tail feathers black, and then gave multiple washes of Liche Purple, Leviathan Purple, and Storm Blue. The result is subtle, but its there, and you can see it in bright light.