Check out 'CarbonLook' from tapeworks.com.
(
http://www.tapeworks.com/Pages/carbonlook.html)
It's only $19.95 for 2 sheets (enough for 4 sail panels).
It looks good (in my opinion) and have had it on my
car for about 2 years with no wear.
That's only $10 per car. Pretty darn good if you ask
me.
You can see my sail panel at
http://chicago-ceg.freehomepage.com/svt55.jpg Good luck.