The smaller size can be used for flannel or possibly smaller yarn??? I need the experts in the group to tell us about this.
The post below will show you a pattern for a simple edging and a little bit more elaborate one. I don't know how to crochet, but my mom's friend is supposed to teach me. If not, I'm hoping that one of you can. I believe the only stitches we need to know are the single and double crochet. Believe me, if it was going to be too complicated, I wouldn't be doing it. I like to make things that I enjoy working on.
Anyway, here is the link if you want more information:
See posting on 12/21/2010 and 5/3/2011 for patterns!