First of all I have to acknowledge 21XDC and the shoelace, I bet that actually looked pretty cool coming through the water. As for yarn, I can see it working, I've been tying with these Dragon Tails I got from Barlow's, it is basically a tough chenille which is similar to yarn and it looks awesome in the water. While I haven't seen yarn or a lot of other stuff I can tell you there is a thing called a "satin jig", crappie and panfish guys in certain parts of the country tie these up. They use satin ribbon and cut a length off and then remove the fibers which are super thin and very limp, I have tied several myself and caught crappie on them. Show us a picture of it, I would love to see how it looks.