I know exactly what you're talking about..
I saw this type of tint yesterday on a Civic while driving down the freeway. I almost pulled along side of him to ask him what type of tint that was. Really cool looking IMO! It's kinda like the finish you'd see on a really expensive pair of sunglasses, not totally reflective but a slight silver reflective-type tint.
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi