Sorry for the late reply... but painting your burner silver is very easy!
At your hardware store, they have a special silver paint for painting radiators. It works like magic, leaving a non-smooth surface that matches brushed aluminum very well.
Well, IMHO anyways.
My burner came with tan and black bezels that I could change out, so painting was easy.. just paint the bezel and front of the tray separately. Don't worry about the insides or the tray... you never look at it anyways.
Here's a pic, you can see it on the right-hand comp: