Wow that cake is awesome! It almost looks like it's painted fondant, though. Hmm, hard to tell. If it's not painted, then I have no idea how to do it.
I'm certain that those stripes aren't individually applied.
I'd cover the cakes with a fairly thick layer of fondant and then I'd use something(my choice would be the plastic PME small pizza wheel) to mark fairly deep curving lines, being careful to not cut all the way thru the fondant. I'd let the fondant dry and then paint it.
You would do it the same as if they were staight lines. I know there is a tutorial on youtube for the straight lines. They started with a base layer of fondant and then applied the stripes on to of it. You would cut they stripes in a wavy pattern to fit togther as you applied them. That is what the video showed. HTH
Thanks for the tips! I may just try it both ways (painting and applying stripes) on a dummie cake first and see how they turn out.
be sure to post pictures....
Alas, I found a cake here that has a similar effect. Painted with lustre dust.