Draw a random spirograph by pressing "Add random spiro" or clicking anywhere on the page. If you want complete control; in the "Parameters" folder of the upper right control box you can see all the different adjustable variables to make any shape that you like:
Originally created as an example for my D3 tutorial "Animated (dashed) lines in d3.js with Spirographs". If you'd like to save the resulting image as an SVG I'd suggest using SVG Crowbar. Very simple and extremely useful in many situations.