Just updating this with a couple of links:

Creating Tears in the Material Room

Adjusting Hue Inside Material Room

Iridescence in Poser 6

More About Fur

Matmatic Fur

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi