I was wandering through the paper section of my local WalMart when I came across this:
It comes in four metallic colors:
The sheets have a sheen that makes them look metallic.
Downsides:
-65lb weight
-I could only find packs of 24, which gives you 6 sheets of each color.
My thoughts are using the chalice silver for large aircraft, and the white silver for smaller military planes. Still deciding on uses for the other colors.
Once I pick an appropriate model, (I'm thinking the B-45 Tornado) I'll see how it handles an inkjet printer and being turned into a model.