Two things here:
This Froggy Keycap Set from Yushakobo is adorable.
It provides a nice visual for keyboard layers! Individual layers can be seen here on the firmware’s GitHub page, but the photo shows a nice color coded example of what layer can be accessed by what modifier key and how a large number of functions can share a small number of keys. The base layer of this keyboard is represented by the black legends. Then by pressing the yellow froggy key, the user can access the functions of the yellow legends. The same goes for the green and red froggy keys. The blue layer is a little tricker, it’s accessed by hitting the function key on the yellow layer.
