Trying to save this formulation for later experimentation; picked up somewhere on the Internet:

• Basecoat with Iyanden Darksun
• Wash with Devlan Mud
• Two thin coats 1:1:1 ofIyanden Darksun, Skull White and Sunburst Yellow
  • Be careful to leave the recesses dark
• Highlight 50/50 Skull White & Sunburst Yellow
• Highlight 70/30 Skull White & Sunburst Yellow

I’ve got some Imperial Fists Terminators on which I’ve just never managed to get a good yellow going, so this is up next to try!

— Edit —

Another formula:

• Basecoat with Iyanden Darksun
• Wash with Ogryn Flesh
• Highlight with Iyanden Darksun and Bleached Bone in 2:1, 1:1, 1:2 proportions
• Highlight with pure Bleached Bone

Also, for white:

• Basecoat of Astronomican Grey
• Highlight Astronomican Grey and Skull White 2:1 then 1:1
• Highlight pure Skull White

I think I like the softer shading on blue-based white schemes, but this looks reasonable as well.