Naff grainy shots but this is what I'm currently working on with the old paintbrush. Mantic Games plastic undead painted, not as corporeal "solid bone" undead in the usual style, but as insubstantial ethereal ghosts.
The plan is to produce an entire army done in this paint scheme with no exceptions. Everything in the army is a ghost and painted in this otherworldly green glow. I'm taking inspiration from things like the Deadmen of Dunharrow in LotR and a Russ Nicholson illustration of a host of ghosts in an FF book (exactly which one I forget).
This is unbelievably quick and simple to paint - black undercoat, top one third in Citadel Codex Grey, the bottom two thirds drybrushed lightly with the same paint. Then the area around the face is drybrushed white (as if the face is a light source) and the face filled in solid white. One good wash with Citadel Thraka Green Wash (the stuff that smells like cheap cider).
Still to do the bases, which will be done in a "Welsh Slate Quarry" style with dark grey rock and gravel, dotted with static grass. But I chuck the quick pics up because I know a couple of my gaming mates who read the blog were keen to see what the final effect looks like.
For me at least, this yields better results than the approach the GW Studio took for their Army of the Dead figures which just look like stone statutes to me. I feel that this approach works because the ghost "fades out" towards it's feet and the stark white of the face underneath the wash makes the evil face pop out and this draws the eye.
I didn't come with the technique myself, it's an adaption of one I found here - http://www.vampirecounts.net/Thread-The-Rise-of-the-Von-Kerryathe-Legion-Picture-Heavy?pid=31508#pid31508