I made the Giant Rainbow Party Pinwheel

I used some discounted plastic file folders for the fins.
A copper piper fitting because it was way cheaper than the Pex fitting
and a three foot dowel to bring the cost way down.

My ball is also an old Styrofoam Christmas ornament -not wood and it worked great  total cost $3.50!

To save on the hole punch which seemed like an investment for one project.  I traced a 3/4" circle then punched out the center with a standard hole punch- and easily cut the 3/4" circle out with nail scissors.

See the instructions here.

They do spin!