Thanks Arch - I usually lean on the box art, but hardly ever copy it, that's too much hassle. For my Cryx guys, I've kept the steel/gold/green glow scheme they use on the box art, but on the cloth I've swapped the various greys the use with a blue green I highlight with warm grey. On other models I go a completely different way, I did that on a lot of the Brood. As for the blending... I've simply practised!

I can say one thing In particular I've learned the past few months though, I've gotten a much better grasp on paint theory. Not color, simply how different paints act and how different mediums can affect them.
And I'm sorry Krule, I can't remember what I did. I think I started with Flayed One Flesh shaded with flesh wash, and I probably tinted it with something else, possibly a crimson wash. Then I am pretty sure some Karak Stone was mixed in at some point... And I finished it with Warcolor Warm Greys. It was an experiment, I was quite happy to make it work out on the first try.