Here's the first real update; some pics of the base.
I overbrushed Calthan Brown over the black undercoat, then mixed in some Iyanden Darksun and overbrushed with that. Next I added a Bleached Bone drybrush.
I painted the rim Goblin Green. This will make it fit in with the rest of my Chaos army. I will add flock and static grass once the whole model is finished.
For the sake of completeness (it seems to be a requirement for all painting blogs these days) I have taken a photo of my painting area.
Next up are the metallics.