Wow KalamaQuilts! That ottoman is spectacular!! If it was in my house, I'd disown anyone who put their feet on it tho.
The first thing I thought of was Dresden Plates. That could work very well for a cushion, and depending on the width of each blade, you might be able to use the wide parts of the ties for one and the narrow parts for another. I am looking forward to seeing what you come up with--if you decide to take on the project.