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Here are a couple of Photoshop brush sets that I made from pencil marks which are good for building up grungy textures. The first set was made from hard scribble marks.

I like to turn the Size Jitter off and set the Angle Jitter to Pen Pressure control around 30% in the Shape Dynamics settings. I set the Scatter to 100% with Pen Pressure control and the Count to 2. With these brushes I like to set the Opacity(under Other Dynamics) to Pen Control so that I can vary the density of the brush with my Wacom tablet. They can be downloaded here: cp_pencil_scribble.zip
The second set was made with softer leads on textured paper. I like to turn off the shape dynamics so that the texture stays consistent. Interesting effects can be had by playing with the Shape Dynamics options, though.

These brushes can be downloaded here: cp_pencil_texture.zip