Crayons are a fairly recent invention, but the principle is very simple, and I think that an empire whose raison d'être is knowledge, all kinds of technology to do with transcribing and preserving information would be explored.
One of the drawbacks of the Grimoire system is that there are fewer opportunities for unusual, not-very-useful sorcery spells. For instance, in AHRQ I could easily introduce an NPC - or even a PC - who has Form/Set Wax and uses it to make crayons. But in MRQ, it needs to be in a Grimoire that belongs to an order, and there's no way a player is going to learn it because who's going to spend valuable IRs on a quirky thing like that?