Landpimp is right on the money. The P9S just doesn't look right in any other color than blue. There are a LOT of firearms that look great when customized. However, the P9S like the SIG P210, are really best left original. If I was ever planning to have a P9S or P210 refinished, it would be black.
What I'd like to see, is a company that specialized in "restoring" classic German firarms complete with the original bluing processes and especially restoring and/or preserving the original proof marks.
Doug Turnbull
http://www.turnbullrestoration.com/ does great work with classic American firarms, and that's what I'd like to see for vintage German firearms. I realize Fords can re-do serial numbers and perhaps proof marks, but I've also heard the font they use doesn't match the factory markings exactly. ARS is the HK factory refinisher, but they aren't going to replicate the original finish on a P9S.