You're looking for a vacuum metalizing facility...
Here's one place that offers colors on the topcoat....
http://www.mmmetalizing.com/index.html


Go here, scroll down to the last paragraph on plastic chroming. It's a good explanation of the process.
http://www.chromeservices.com/process.htm



...and ya know what the bikers say in a song about chrome...

The chrome don't get ya home..
The chrome don't get ya home..
...but you look GOOD, on the side of the road!