Wapsi do sell dyed PC herl, just need to take care when you strip it.
Another great material not used to day is horse hair. It makes perfect bodies, again it can be dyed to any color, very strong fiber also.
It is translucent and provides for great segmentation effects.
so far as l am aware of not available from a fly shop here. I just wrote a article for Fly Tyer related to its use, again a material at one time very popular in the late 1800s and early 1900s.
Davy.