Oh, I also have pics for several human packs based on hair color, they will wait until we finish with tags.
And I used some special characters that don't have a personality at all as random ones. And there is slime pack, since they are able to change shape and color, thus variety doesn't matter. I don't have any more ideas, really.
For example, I tried to make fairy pack twice, for both wm and Pytfall, but it's not easy due to differences in wings appearance and characters size.