I bought a mobile that is intended to hold photos and I modified it by taking off the clips. I then made ten different pinwheels in two different sizes to hang off the different arms of the mobile. I had already hit up the Hobby Lobby for ten different patterns of scrapbooking paper. I cut those down to size and adhered them to each other so that when I bent the pinwheels into shape, the different patterns showed up nicely.
I actually ended up hanging the pinwheels from the mobile by embroidery thread. I think that's the first time I've used that thread - I am certainly not sewing on any buttons - just ask Rick!
We put a small hook in the ceiling and strung up some fishing line (that I made Rick run out and get ASAP!) to hang the mobile.
here it is hanging over the crib