I have some fabrics that were given to my by friends, etc where a square was cut out but I do not do that with mine. If I am buying for a specific project I always buy just a bit more in case I make a mistake. If there is any left over I might cut it into squares or whatever to use for a scrap quilt down the road but I just don't see the need to have a sample of every fabric I own. What's the purpose? I'm not making heirloom quilts -- mine are to be used and loved and if they wear out, I'll make something new. The only time I've had any issues is if I absolutely love a fabric and need to hunt some down via missingfabrics.com or here. I'm busy enough just making quilts that I want to make. Cataloging everything takes up too much of my valuable time and space that could be used for patterns, books or more fabric.