>>How about I do Public Domain, Pets/Animals, and Story Sparks? I'm completely open to what months.<<

January -- Public Domain
May -- Pets and Animals
September -- Story Sparks

Currently I'm researching mass extinctions. You could have some fun with different sublists of pets and animals with ice age megafauna, dinosaurs, even earlier oddities.

>> Public Domain Review is doing an advent calendar reveal (added so I don't lose the link) <<

Oh, that's cool. :D

Thanks for helping out!