The stuff I used is Dupli-Color Metalcast. It comes in two seperate cans, a silver metal flake base coat and a colored top coat. I used the blue, and it gave a nice deep saphire color.....mmmm.
They also had a red, yellow and green.
I got mine at Meijer's (only in a couple of states) in the automotive section, but if you look, you'll probably find it lots of places (chain stores mainly) that have automotive spray paints.
$4.29 for the blue can alone...
And hint hint for modders out there, it works to tint your plexiglass too, but a scratch would show through clear.
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