Nice scheme.
For the blue colour, I'd say it's not a blue in the truest sense, but more of a muted indigo. The closest colour that comes to mind right now would be Vallejo Model Colour's Oxford Blue. If you were to mute that colour with, for instance, (old) GW Graveyard Earth, you'd get pretty close to the colour you're after there. With a black wash over it, I reckon it'd be spot on (but you'd might need some fine tuning, obviously).
As for the gold; the picture you linked to has metal more akin to bronze rather than 'true' gold. So I'd suggest using a metalic bronze paint, highlighted up tp silver. That will keep the colour pale enough to match the picture, but will still give you a yellowish metal...