To start off - I totally ripped this idea off my SIL Leslie's blog. She made hers out of fabric and they are so cute. I didn't have any cute fabric on hand (and the nearest store is 1 1/2 hrs away) so I went with some cute scrapbook paper that I had. They turned out so cute and my little boys were disappointed that they didn't spin like real pinwheels do. I can only do so much. Here are some pics:
If you want to give it a try you can find Leslie's tutorial HERE.