Have you ever seen a crochet pattern that you would love to make but couldn't find the yarn for it? Sometimes finding a substitute yarn can be tricky. Lily Yarns has an online yarn substitution calculator called "Yarn Switcher" that may be what you need to help you substitute yarns. Give it a try. It's at --> http://www.sugarncream.com/product.php?YARN_SUB=1 .