Dry markers for a dusty look!
Tried to make a pencil, but came out with a dry ink look.

(Left: dry marker flat, Righ: round dry marker)

The above was entirely colored in with the flat dry marker. The outline is another tool and a bit too dark, sorry. ^^;
The Dry Markers work from Opacity and Density alone. Feel free to change the pressure, texture, tilt, blending mode, etc.. If you want to mimic real markers, I'd suggest turning the blending mode to Darken or Multiply :0

I also made them as wetter markers: this was all done with the "Dry Marer - Less Dry"brush! I think it gives a really fun painted look. :)
More examples:

1 - Flat Dry Marker
2 - Round Dry Marker

3 - Less Dry Marker, Flat
4 - Less Dry Marker, Round
Lastly, I threw in some fun tools:

5 is a pure blender, and smears the canvas without leaving extra paint. 6 makes water marks for the fun of it! Feel free to adjust these as well.
Thanks for having a look, I hope you enjoy them if you download them! :D
Markers
Blending & Marking