This is part of the intro to sketchbook that I do within the first week of the students receiving their sketchbooks.
It requires pretty basic materials that most classrooms hopefully have
These are REALLY experimental and open...it gets students used to the idea that sketchbooks aren't just for finished artworks, but are also for experimentation and playing with materials.
You could have students complete all of them, or sometimes (depending on time), I assign them to pick just 5.
They have fun - and it opens up new avenues for final artworks!