Okay...so heres my take...Im actually serious here...
If you detail your stock calipers, clips and pads with carefully chosen colors, it will look very cool. maybe gold for the retaining clips, black for the pads, red for the actual caliper, you are actually celebrating the design that BMW has created. Silver can replace the gold if that color offends you.
Then, get a set of those really nice brake lines and it will look pretty cool under there.
Paint the rotor centers silver or body color, and give some attention to that crusty dust shield...Dust shield should be body color if your car is dark, maybe satin or gloss black if its a light colored car.