I have OEM covers painted black and love them. BMW carbon mirrors look great too. I might have gone that direction if I had a carbon roof to match.
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust