Shader Ideas - Friction

[nuxttux]

Hi - Shaders are interesting and although I don't know what I'm doing, I have a few shader ideas.

If anyone knows how to improve them, they're welcome to pitch-in.
List of Shaders

@rodlie If you could please take a look at the Rim Light shader, and let me know if there's a way control where the shader is applied in such a way to keep it off the path stroke - in other words, to constrict it to the path fill.