You know what? I just noticed the directions for your pinwheel origami are kind of... well, I'm hesitant to say "wrong," because maybe you can get a pinwheel by starting that way, but I don't think you want to fold the corners of the paper in at all.
Here's a method I think would work better:
http://www.tinyshiny.com/HowToProjec...nWheelPage.htm