Silver is the appropriate color for everything but speakers.

Keith Herron offers his faceplates in a great gunmetal gray color.

My preference is the champagne color Atma-Sphere used to have, like on the M-50 and early M-60. Elegant, tasteful, classy.

I've always hated silver faceplates (I ordered my ARC SP-3/D-75/D-51 in gold & black). I made an exception for the First Watt B4, which was not offered in black. More recently, I made an exception for the EAR-Yoshino 868 pre-amp, available only with a chrome-plated faceplate (which is acceptable). BIB, baby.