I ran into "Blazoning Tortall" by ChimeraKitten bouncing around the internet earlier today, and it seems like the sort of deep obscure fandom nerdery that folks here would appreciate (*pointedly glances at hS*). It was neat to see what the various coats of arms in those books might have looked like, and some of what they might reveal about folks in said books - as well as showing Tamora Pierce doing more research on the topic over time.

I also found that said person did a reconstruction of the Belmont achievement from Castlevania which also seems to be a solid "heraldry 101" document.