These were thought up and drawn by the inimitable Santiago Cohen.
These are meant to be simple, 5 second, 'bumps'.
There's something about these boards (the above in particular) which makes me think of Folon's TV ID from the late 70s.
Folon's an illustrator who's fallen out of favor. I wonder how many American animators have even heard of him.
This would have been mixed media. Simple. Fun.