I have a small problem or a big problem, the choice. I have a field of petals like in the image attached. I would like to have a movement like a breeze, like a field of grass with wind. I would want petals move around their initial position. I would want the same effect as in this video (http://www.youtube.com/watch?v=MVKWWI7hwh4), but with a field of petals. My main problem is to make petals make a go and back with the petals.
all your tips are welcome. Once again, I need your help :)