Epispiral Plugin

I've just been playing around with a variation based on this mathworld.wolfram.com/Epispira… I found at Wolfram MathWorld.    

I've put a rough render made using this variation in my scraps www.deviantart.com/deviation/6…

Here's a download www.megaupload.com/?d=VB5Z14D3 for the plugin if you want to play with it too.