Beth of Stitch.Rip.Repeat has a tutorial on how to get the best circles or other shapes made by using freezer paper (yay!).
I’m always coming up with ideas for quilts that involve curves or otherwise un-patchworkable pieces. This it the best way I know to precisely attach shapes to one another without hand stitching it (which is also rewarding, just not so fast).
Check out Beth’s tutorial on the Stitch.Rip.Repeat blog here – Link.