I've been experimenting with trying to crochet with macrame cord since last summer. I made this doormat with 6mm cord. The pattern you might recognise, it's the sunburst pattern and there is a great tutorial in that link. I've made a large blanket and a shawl from this pattern, and few other things.
I also made a little basket out of the 2mm cord. I don't have any good pictures of it yet, but soon!