I know this is way early but I had some ideas and wanted to get them down before I forgot.

How about some royal-themed zombie items? Prince(ss) items like ragged gowns, tiaras/crowns, swords, shields, jewelry, coats of arms, etc.

It is NOT early, it takes staff at least three months to prepare for each holiday. There's also a Survival 2020 thread in existence, although you may have its creator blocked?

The current leaders of the Underground, NPC Ecks and NPC Skitters seem pretty antt-monarchial to me. Ecks is all revolutionary cadre and Skitters is all libertarian and stuff. The actual royalty of Subeta like King Keith, Chancellor Phoenix, and all the other Counselors seemed to be unaffected.