Thanks, guys! Yes, sadly, I know it's late. Plus, while I am not sure how difficult it would be, I am sure it would be very time consuming.
Still, here's what I had in mind. As I said, a bit more subtle than here but you get the idea:
What's wrong with the stormtroopers is that their armor is very polished and reflects various kinds of light sources, but not the bright flashes of their blaster carbines. Also, their lenses look like cheap opaque plastic (which it is, I am sure). Polaroid tends to be more reflective.
Anyone, just wanted to share. :)