You've heard of Elf on the Shelf. I've found that the elf is the best low-cost passive program to engage patrons through pandemic times and advocate for our library. My library elf, Tinsel, promotes programming, library services and reading.
The inspiration came from how teachers utilize their elf for classroom management around the hyperactive holiday season. Libraries can use an elf to promote library events and excite patrons with the silly hijinks that the elves get into.