Usually, when one makes a crazy quilt, the idea is to use up the odd shaped scraps from your stash. Most do not use a template like with paper piecing. If there is a particular pattern that you are wanting to use, you could try pinning the muslin to the paper and then piecing without transferring the pattern, by looking thrugh the muslin with a strong light to see where to place the fabric. Do it the same as you would if the muslin wasn't there.