You know, this tread has really got me thinking about all the different colors you can get by inlaying different metals, especially if you treat them to get different oxides of that metal. You could potentially get a wide range of colors, not just gold, silver, or gray. There are different colors of gold from white to yellow to pink. Silver can be silver or black. Steel can be silver to black, several shades of blue, red/brown. Copper can be reddish brown, brown, or blue/green. Brass can be yellow, reddish yellow, or blue/green to green. Tin could be silver or gray. I am going to have to tuck this away in the back of my mind for some future project.