Chosen cover for the resource, I like that it shows all of the signs all at once so this way it can be used as a quick reference. It shows them in order so not massively important that the letters are on there supporting, although it wouldn't do any harm in terms of usability.

I went through a few ideas of how to do this, shown in this pdf:

I think it's important to keep the white border, but I didn't want it to become too blocky and so I joined them all up in a grid.