1) Black Primer
2) Khorne Red base coat
3) Agrax Earthshade wash
4) Wazdaka Red drybrush
5) Squig Orange zenith drybrush (top down)
6) Baal Red (or whatever the new equivalent is) wash to finish it up
Bam! Now you can put your brass on, pick out some black details, metal up the guns... give those bits a wash and call your CSM finished. And they really pop with that red color too! This method allows for batches, without spending all that time highlighting and blending each model. The 4 CSM above were completed in 2 sessions, approximately 4 hours of work. An hour a model ain't too bad, huh?
It's actually probably less than that... I have already applied base coats and the first wash to the remainder of two whole squads (16 models). So I am on course to having these two squads done by Friday, when I have a game with them.