I liked my other GeoGebra string art maker ([url]http://bit.ly/GGBstringart[/url]) but I wanted to be able to put the strings on a curve also.
This sketch has a function with strings on it. You can change the function, the number of strings and the space in between them.
But you can also use the tool to make however many pieces of your own. Unclick the example to see the directions for the FunctionStrings tool.