Experimented with some settings last night and came up with some interesting metals. There's some chrome, aluminum, and some Holiday ball type of materials. Here's a shot of the scene:

You can get the max file here.
You'll need the free Uffuzi HDRI probe from here to view the scene:
http://www.debevec.org/Probes/uffizi_probe.hdr
Here's the materials file: Vray_HDR_Metals1.mat

You can get the max file here.
You'll need the free Uffuzi HDRI probe from here to view the scene:
http://www.debevec.org/Probes/uffizi_probe.hdr
Here's the materials file: Vray_HDR_Metals1.mat