Ooh this looks interesting as a small mod... LED upgrades to the cabin/map lights and footwell/puddle lights etc.. Official BMW kit too.
http://www.schmiedmann.com/Z_series/Z4-E89/Equipment_-_accesories/Equipment-styling_-_inside/page4.htm#1943503
On second thought having looked at some pics, they might look a bit chavtastic, though LEDS for puddle and switchable map lights might be the best mix. Leave the cabin/footwell lamps yellow (warmer less chav look). Hmm... maybe.
http://www.schmiedmann.com/Z_series/Z4-E89/Equipment_-_accesories/Equipment-styling_-_inside/page4.htm#1943503
On second thought having looked at some pics, they might look a bit chavtastic, though LEDS for puddle and switchable map lights might be the best mix. Leave the cabin/footwell lamps yellow (warmer less chav look). Hmm... maybe.