I've made my own Silver/gold decals with info gained online. Can't remember where but I saved some of the images.
I use Adobe Illustrator and a Monochrome Laser printer with Laser decal paper.
The tutorial has you wetting the decal and then flipping it over so you can paint the reverse.
However with Illustrator you can flip the image so that it's reversed on the first print.
cheers, Mark.