There are so many types of yarn. I have a toy box full of it. There are the cheep yarns, which tend to be a bit coarser and thinner, there are baby yarns that are soft and thick, there is fun fur ... Fun fur is my particular favorite. It's so much fun. It's harder to crochet with (I love crocheting, too. I usually make my fake food with crochet), as it is harder to see the holes, so I mostly knit with it. You can use ribbon, or if you're really desperate, you can cut plastic bags into loops, link them together, and crochet or knit with them. I'm making a mat out of plastic bags right now.
All in all, I'm so thankful for yarn. I'm glad God gave man the ingenuity to come up with it!
A yarn Ice Cream Cone I made.