I think I understand what you are asking about the fiber and making a brush. Let's see if I can put it into words, LOL. If you want to make a fiber brush you wouldn't make a brush for the whole fiber, just a section since you use brushes to draw or stamp. There is a brush tutorial that explains it here.
http://www.scrapbook-bytes.com/tutor...iber-brush.htm
A lot of brushes that you see used are used the way rubber stamps are. They give you a one color "printed-look" image. Element JPGs usually have a 3D look and are usually made up of more than one color, with drop shadows, and bevels. But, lets say you make a fiber brush and you make your fiber on a new layer, then you can apply layer effects like bevel or shadows, filters, and styles to change the look. Eyecandy is used a lot for making fibers. -Ali