QBrush variable thickness/texture

[xtingray]

Hello again,

Right now, I'm doing a little research about how to develop complex brushes for
my application.

I was checking over the basic examples from the nokia website:
http://doc.qt.nokia.com/latest/tools-plugandpaintplugins-basictools.html

And the brushes from the Krita project, specially the "Hairy Pen" plugin:
http://www.koffice.org/download/

Although my project is focused to vectorial animations, I would like to know how far I should
dream of special brushes with variable thickness and texture (I already use the set of
pre-defined textures from the class QBrush). But, what about oil painting? charcoal texture?
Is something like this possible with a realistic appearance? Only in the "raster" world?

Any ideas, suggestions or code examples are very welcome.