I am enjoying testing crayons, oil pastels and watercolor as tool for making a "Calligraphic Still Life". These are unlikely partners that travel easy with your sketchbook.
Making the composition more abstract by enlarging, going off the edge of the paper, and blind contour drawings.
A variation for weaving all the way to each end of the spine of a book. The full detail for the binding is in my online course Speak To Me From Everywhere.
How to hold your brush and learn to make the fundamental moves for lettering.