The colour thing is obviously personal taste. THough I do remember our art teacher stressing that blue and brown are a "discordant" combination of colours.

Two of the most attractively colored guns I have come across were a Holland and a Dickson sidelock, both displaying a rich grey silver patina that I guess was left after the original colour case hardening wore off. Does anyone know how to speed up the process of colour fading to get to this beautiful grey patina faster? Without resorting to power brushes that polish old guns making them look like fake coins.