I piece them together by butting the edges up against each other and zig-zagging them. Then I used them for wall-hangings that I know won't be laundered very often.
JoAnne's has queen sized Nature's Touch 100% cotton batting on sale today and tomorrow for half price :D So I came home with two of them. I do have some large pieces of other batting that I will use in the quilt I'm currently working on.