I've moved on to lesson 6 in my Drawing 101 class (artclasses.com) and it was on light and shadow.
I used toned paper and drew with graphite pencil and white pastel (for samplers), white colored pencil (for still life) and white gel pen (highlighted edges on still life)
Our first assignment was to take some items we had drawn in lesson one and use shading to make them dimensional. I did a few cubes spheres and cones on my first sheet:
Then a few cylinders and combined shapes on the second sheet. These sheets are both cut off as my paper was larger than the bed of my scanner.
The final project for lesson 6 was to draw an assigned still life from a photo supplied to us. I used a grid system to transfer the outlines.
I didn't like the fugitive nature of my white pastel pencil on the samplers so I switched to a white from my set of colored pencils.
After I had drawn and shaded the outline remained and I did not like it along the highlighted areas. So, I used a white gel pen over the pencil lines, smudging with my finger where it was too stark.
I guess that makes it 'mixed media'!