I think any body coloured performance spoiler looks nice. Not keen on the carbon look though.
I've just ordered mine and on route to me, will attach it when I get the car...
Gone: E46 320D Sport | Silver Grey | Xenon | Heated Leather | Rain Sensors | M Sports package II
Driving: http://mybmw.co.uk/x1j0z7b7 | F30 320D ///M-Sport | EBII | Black Leather | Visibility Pack | Adaptive Suspension | Media Pro Pack | BMW Apps | Sports Auto | Sun Protection Glass | EU6 BluePerformance Diesel