Are you planning to quilt on a domestic machine or a longarm frame? I agree with PaperPrincess if you are planning to use a frame. If you are quilting on a domestic machine, what I would do is wavy lines from one end to the other. You can use a walking foot to do this and simply move the quilt from side to side to create the waves. I will see if I can post an image of what I am thinking of:
http://sewfreshquilts.blogspot.com/2...al-finish.html
http://jeliquilts.blogspot.com/2013/...-festival.html