Diane Gaudynski has a great technique for doing straight line quilting with a free motion foot. It is to avoid all of the stops and starts with grid quilting. I used it on a quilt that I just finished and it works pretty nicely. Using this technique will also allow you to combine more straight quilting with some curved quilting without changing feet. It is in her book Guide to Machine Quilting. I was able to borrow a copy from my local library.
I would SITD to stablize the whole quilt and then outline the pinwheel in the individual blocks. If you wanted them to pop more then you could maybe go back and outline the dark base (under the pinwheel). It has just enough of a gently curve and it would look nice and not be too hard.
Last edited by AFQSinc; 09-01-2012 at 06:23 PM.