Here is a screenshot showing the basic structure (functionallity) of the shader. This is important for you, if you want to understand how it works, and also to tweak the appearance to your liking.

Foam comes in very many different qualities, very wet and glossy, slowly drying becoming less reflective and more translucent, thin or fluffy foam, and so on. If you understand the main components of the shader, you can adjust parameters to achieve many different types of foam.

Poser Pro 2014 GameDev, Lightwave 11.6.3, Blacksmith3D Pro 6, Bryce 7, Carrara Pro 8.5, Reality 4 & LuxRender, Python 2.7 & Wx-Python, UV-Mapper Pro, XFrog 3.5, Paintshop Pro X7, Apophysis 7x64

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Don't render faster than your artistic guardian angel can fly...