Aharon Rabinowitz did a tutorial using particles and the puppet tool to simulate an air flow over a car. You should be able to modify that for a shoe.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.