BMW Z4 cars have a turn signal on the side of the fender, that has a clear space between the BMW emblem, and the car, it acts as an indirect lighted blinker.
You should take a real BMW emblem, make a 1/2 inch thick piece of acrylic or plexi to the round shape of the BMW emblem, then put some LED's inside it so it lights up when you turn the PC on. Then it will emit light around the emblem from behind.