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I'm making this Dresden Irish Chain (a free pattern I found from Moda) and am planning to quilt it using some iteration of quilt-as-you-go using various scrap pieces of batting that I have left over from the past several years. I have no idea what kinds of batting these scrap pieces are, other than I know that none of them are wool or bamboo. I think I have only ever purchased all cotton or poly/cotton blend. Here's my question: If I use these various battings and they are not all the same, am I going to run into trouble when I wash the quilt if the batting doesn't shrink at the same rate or any other problems that I haven't thought of? Should I just buy yet another round of new batting? What do I do with this growing mountain of scrap patting? I have no desire to make placemats, bags, or other small projects..... Thank you all!!!