It was really lovely in the Hollow and they seemed to go all out, I think sledding would've been a nice addition; maybe even make it a game like animal derby!
Or snowflake inspired wings-- possibly just as a silly sweet or maybe as a wing style/decoration that you could acquire.
I so loved the winter outfits (boots and especially Tink's coat) I would've loved to see more, especially furry and frost fairy (movie) inspired designs.