I have HID Lights (don't know what brand; they came on the car when purchased), and as of recently I've noticed my headlights have changed color; though it's not the glass housing, but I mean the "light" itself. They used to look White (or Yellow depending on the angle) like so:
Now, I (clearly) have one Blue, and one Yellow, as seen here:
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Swap the right and left bulbs to see if its a problem with the bulb itself or with the ballast. Most cheap aftermarket bulbs will change color gradually over time. With all these $40 eBay kits floating around I'm surprised they light up at all lol. I'd invest in some genuine Philips or Osram bulbs and retrofit some Hella ballasts in there. Not cheap but it will be OEM quality.
I've had my DDM HID's for about a month now and one light appears to have a green tint while it's warming up. I checked where I mounted my ballasts and they seemed a bit wet, which is frustrating since other posts here on CL say that was a dry location.
I have a feeling it has somehing to do with the ballasts and wires being wet. The weather has been extremely rainy here lately, we'll see if anything changes once things dry up. Otherwise at lead DDM has a lifetime warranty.