Quilters Cache has several Pinwheel blocks. Scroll down about halfway.
http://www.quilterscache.com/Alphabe...stPageM_R.html
Pinwheels can be simple or complex. Hopefully you will find one you like on this page. There are 2 ways to design a quilt.... pick out your block(s) first and get your result from that, or figure out what size block you want to make, then see how many blocks it will take to make the desired size quilt. Either way works.
These are some simpler ones from the EQ library.