First number controls size, second is resolution... play with the others!

GenerateURL:
   

The generate URL button will reload this page, with a page location that includes a data area ('?vals=... ... ...') to generate whatever is the current pattern. You can keep your favourite patterns by saving the page in your browser favourites, or you can email the entire url to show other people your favourite sets of values... e.g.

http://www.cleverpig.com/examples/spiralgraph.htm?vals=15:10:3:5:2.2:-4

or these...

knot      flower