I've not done, toyed with the idea but just never got around to it and now with the missus driving the car and me hardly ever it, not sure it will happen.

I know these guys are on e90post and offer a forum discount: http://www.horizonleds.co.uk/bmw-e90-e91-e92-interior-led-kit

I think SSDD motorsport might do them also, but to be honest I am never sure if they are any better than an ebay purchase for all they cost. I don't think the interiors cause any bulb errors if they fail iirc.