You could also make a giant Dresden plate. Sewing with Nancy has templates, or you could make your own. If you have EQ software you can print it any size. Select templates for printing option, choose a block size, and delete all the templates except the circle and blade.
Here is link to view SWN episode. I think there are two episodes on Dresden Plates.
http://www.klru.org/episode/sewing-w...resden-quilts/