I have grills, gills, hood vents, ///M3 emblem, and the M5 style mirrors in gloss black on my Space Gray E90. I even replaced a pretty rough looking lower mesh grill with a new one i painted gloss black before installing it. I think it's a perfect look against the gray. The E92 is not nearly as difficult to replace the gills. Use the tape technique found in the DIY. I have pics in the cosmetic mods section.
'09 E90 M3 SG | VF620 SC | KW V3 | ARC Wheels w/AD08 | OnEighty Lights | BPM Sport coding | AA Catless Exhaust | BMW Performance Wheel | Recaro Child Seat
'13 X3 DSB with M Sport | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me