I used flat black paint with a brush. pretty easy. Use a nice paint brush not a cheap crappy one. Also, have a paper towel and some solvent handy to wipe up any mistakes.
What fries my ass, is the chrome pealing from the tip of the front dart about 1/4in from the tip. It just looks like a white line in the picture, but it's a bubble.
I think the black chrome look would be awesome!
I think you would want to buy a new set, and treat them before you put them on the car. I cant see removing them and reinstalling them, and I wouldn't dare try to mask them off to spray.