String Art
This is just for fun, to support students making string art.
There is, of course, a lot of interesting mathematics here, too. What is the curve created, how does it depend on the vertices, etc.
Let me know, @mathhombre or goldenj@gvsu.edu, if you make something fun!
Also see the newer sketch, that lets you fit strings to functions: http://www.geogebratube.org/material/show/id/46238
More GeoGebra at mathhombre.blogspot.com