It's so much more handy with one big image. I read this board also is for art tutorials, so- Here is a brushpipe tutorial.

Haven't tried it yet, but will. Looks great.

I have already found this out myself, with some gifs I made. Spinny head animations from my head textures look awesome as brush pipes when the spacing is low. Looks 3d :P

Depending on which pipe, of course. I also found out how it worked by myself, by watching the sparks brush.