I had it done on my M3 by the dealer acutually. They sold a kit to put in Silver trims, but I had them paint it Laguna Seca Blue. It wasn't tacky at all. It was very suttle. On an X5, it may be a little tacky because the trim is facing the oncoming driver. In the E46, it's on the top and bottom of the lights so you only see it standing in front of the car.

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Dave Raines
2006 BMW X5 4.8is Le Mans Blue
R.I.P. 2002 M3 Cabrio SMG