The Blanton Museum of Art at the University of Texas in Austin has a large outdoor installation of stringy rubber tubes that kids can tie into knots, or grab in bunches to climb or swing, or just run through!
Cute, easy, and rustic!! Twine Star Decoration Wrap jute around a frame made from wooden shims for a Christmas decoration with a natural, rustic look. Nice and Very easy to do! http://lowescreativeideas.com/idea-library/projects/twine-star-decoration