There is a couple of cars on Focus ST Owners club with black/carbon effect roof's but as your car is a dark colour it might be missed when people look at your car.
Profile Automotive/Code Red do a carbon effect dash kit so have a look on there site or FSTOC.
Another mod that people are doing is changing the colour of the SMD's on the dials and radio etc. I personally know the guy that does them for Profile and his work is spot on.
As for the brake lines i don have them on but they can only make the feel of the brake pedal better when abusing the car out on a track etc.