On the rare occasions when setting my students a task to do coincides with me not having some fucking spreadsheet to suck, I "join in" and have a scribble myself. Here are a few from the beginning of the 2013-14 term.
Drawing from life
Texture Grid
Perspective drawing
Negative space
Charcoal drawing
Grid drawing
Draw your house [stylised]
Draw handbook for your ideal course
Sardinhas
Taking your line for a walk
Making a Brew –storyboard [from the milk’s POV]
Magazine cover
Mind-mapping for self-branding exercise
Speed Life Drawing: 10 minute poses
Speed Life Drawing: 05 minute poses
Speed Life Drawing: 01 minute poses
Speed Life Drawing: 01 minute 30 second poses with two people
Speed Life Drawing: 01 minute poses with subject moving