http://www.webdesign.org/photoshop/drawing-techniques/spyrograph-effect-exclusive-tutorial.14868.html
Spyrograph picture. I thought this one looked pretty cool

http://www.youtube.com/watch?v=FOv_8hJu45k&feature=related
Really neat laser spyrograph from youtube

http://www.youtube.com/watch?v=BYpEgW6SQWw&feature=related
interesting video of various spyrographs