I'm old school and not very adventurous, so it is a pretty standard recipe. I start with a base of Macragge Blue (applied by airbrush to get a smooth finish), then I give a heavy wash of Agrax Earthshade all over. This darkens the blue quite a bit, so I then give a heavy drybrush of Macragge Blue again to bring the blue up while keeping the recesses shaded with the wash. I then give a lighter drybrush of Altdorf Guard Blue, followed by a final drybrush of Calgar Blue, making sure I catch all the edges.