GJL & Alan:
Such diversity of styles: Breath-taking work!
I am working on a public version of the filter that I used to create some fonts from paths - like the x-ray one. I made one a while back but that was primarily intended to use with brushes. This one was really meant for paths stroked with lines - although it does work with brushes too. Just need to try and make use of the old character path format with this plug-in and I will post it.
Here are some examples using a pink gradient and line (top right) and then with a plain round soft brush and then with a rose brush (originally from deviant art if I remember correctly) using the various stroking options.