I have access to a wood laser engraver so I'm gonna try it in wood first and then see if it can do some type of black abs plastic.
I made my 'Farnsworth's Farnsworth' plate out of chemically etched brass, then painted it black, Jump over to http://beachcomberbob.tumblr.com/ to see my progress on the build. Because they're bass ackwards, showing the latest first, you will have to scroll down about half way to see the project from the beginning.