I've just been playing around with a variation based on this http://mathworld.wolfram.com/Epispiral.html I found at Wolfram MathWorld.
I've put a rough render made using this variation in my scraps http://www.deviantart.com/deviation/61368503/
Here's a download http://www.megaupload.com/?d=VB5Z14D3 for the plugin if you want to play with it too.