Having worked a lot of my Grey Knights Land Speeder, one of the key components is the replacement crew. I could have used the included plastic Space Marine crew, but in the end I used some metal Grey Knights models. I started with a black basecoat and then gave the armour a basecoat of Boltgun Metal. This was followed with the gold metal parts been given a base coat of Brazen Brass.
After painting the base coats for the purity seals and other iconology on the Grey Knights, I gave the purity seals a top coat of Bleached Bone and highlighted with white paint. I then added text and writing using a fine brush and thinned black paint.
See the full workbench feature.