What would be a good secondary color on a white car other than black?

I just bought a 2010 white challenger. It is completely white with no stripes or R/T symbol. Now I am planning on buying some black rims to put on it 20". Also the interior is really nice, with a screen and upgraded chrome brake and gas pedals and chrome T shift stick. The only problem is it has cloth seats. So I am going to put leather in it, since my car is white I decided to put white leather in the car. But I need a secondary color to make the stitching. Also I am going to buy dual halo lights for this challenger and since black is the obvious color people would say looks good with white Ive thought of that but, you cant buy black lights. So I would like to know what color would look good on a white challenger for halo lights and stitching on my WHITE leather seats.