I found this through a link on Pinterest. (I love Pinterest, and spend entirely too much time there. *sigh*)
“This technique is similar to the padded construction of Irish filigree crochet but used less decoratively. It’s made by carrying a thicker cord, such as cotton clothesline, inside a densely wrapped row of single crochet.”
(The pics are links to Yarn Monkey’s blog post for instructions)
I hope this gives you some good ideas. Now, I need to go back to The Yarn Monkey’s Chronicles and have a peek around!