I decided to wrap mine in carbon. Some pics can be found here:
http://www.audi-sport.net/vb/new-a3-s3-sportback-8p-chassis/98649-my-first-audi-a3.html
I'll be getting my rear s3 diffuser wrapped in the same style in the coming weeks.
The work was carried out by a guy at EMTuning.co.uk
I was quite hesitant to get this part wrapped because of the 'fork' parts causing problems, but he did an
excellent job and would highly recommend him.