What I ended up producing from Crayola Crayons and the Toys R Us brand, Imaginarium Doodle Pad was surprisingly decent.
When I was a child I used markers to draw along with Captain Bob on weekend mornings - so I wasn't so surprised what could be done with markers, but also I use highlighter markers for shading and effects.
I remember as perfecting the techniques a lot better as a child than now, none the less still producing some very decent works.
Markers and Highlighters