In Middle School art, everyone keeps a sketchbook. We use them practically everyday. In them, we do daily warm ups, sketches (pointing out the obvious, here), and what I like to call mini labs.
This is how we set up our sketchbooks. I require everyone to do 5 "Sketchbook Ideas" from the chart I provide. It is a HUGE plus, if someone uses that sketchbook beyond what I require. I love it and it makes me smile beyond belief.
Below are some examples of what some have drawn in their sketchbook
Below are examples of our first mini lab - illustrating the elements and principles of art.