If you want actual performance out of them, I would do the M5 projectors with 3000k HID's in them.
If you are going more for looks, I would do this, but in 3000k
Usually they are 5-8 hi-power 1-watt LED's. I did some searching, but couldn't find what I was imagining.
I have bright white LED strips running from my fog wiring right now bc my fog housings were all cracked and foggy. I had 6000k HID's in there at one point, but took them out.