The Silverstar 3157A is what you are looking for...
on Amber off looks silver/blue

http://www.autobarn.net/31hipesili.html

Yer, that'* the one, my friend has that on his Malibu.

(As you can see from my signiture) I painted my parking lights w/ silver paint, so they are silver when off but still yellow when they're on. Maybe you could try painting yours with that blue tinting paint?

just an idea

-Brad

I did that too on my GP
In my case the lens is not see thru...
If mine was a total clear see thru i would have done the silverstars myself

the paint worked out great tho for me