Nice work. I especially like the P-node constraint.

I remember working on a foam shader a few years back, which I eventually used in my 'Two Girls One Cup' gallery image (Nudity tagged added to this post because of this link). That foam shader eventually found its way into EZSkin as one of the 'special effects'. It'll be pretty cool to see yours in action too :-)

Free stuff @ https://poser.cobrablade.net/