For what it's worth, BMW calls this the "Light Carpet". "Ambient lighting" is their term for the optional internal lighting.Snapped this pic the other day and thought I'd share. Haven't seen too many pics of the external lighting out there.
Given sufficient funding, any modification is possible. This one would likely not be economical in the least.
I'm actually more interested in the exterior lightsIt seems like adding interior ambient lighting, relative to some other mods, is not exceedingly difficult if you don’t need it to be as clean and fitted as the OEM setup, and if you don’t need it to be integrated with idrive. Anyone who knows they want ambient lighting should just get the package for it.