We are working on illustrating our own letter books. For letter K, we traced keys.
A bunch of odd keys are fun to sort and classify, or just pretend with, and drawing with them is fun, too. (We use them for activities in Workjobs by Baratta-Lorton - a great book for early math).
One chose to spin the keys around the same hole (motion) and another defined the key with color inside (positive) and around (negative).