This model was the first time I had experimented with mixing paints for highlights, and I've started using it quite a bit since. The blue armour scheme goes like this:
Base: GW Caledor Sky
Wash: GW Badab Black
Retouch: GW Caledor Sky
Highlight: GW Caledor Sky and GW Ceramite White approx 2:1
I chose Caledor Sky because it is a shade lighter than the current recommended GW base for Ultramarines and I wanted the model to have a really nice strong blue similar to the 2nd edition era box art. I showed it to Kobrakei this week and he immediately said it looked "well 2nd edition" so it's mission accomplished as far as I am concerned!
Here are the two captains I have finished in the project so far...
adapted Dark Angels minis for my Salamanders army.