while I'm reading through the posts I saw one that makes me have a question. Its about machine applique. The quilt I was looking at was this one
http://www.quiltingboard.com/posts/list/24772.page
now are these done using interfacing or are they just put on and sewn around? If they're just put on and sewn around what about the fabric fraying over time thru the stitches? Sorry if this is a dumb question!