Pretty Serious Blue Gums on Boxing Day is from the Christmas Without Snow Collection.
The name cracks me up because it conjures up a mental image of chattering teeth on a winter’s day or the way Polar Bear Plunge participants must feel after they jump into the freezing water.
Wikipedia says that a Blue Gum can refer to Eucalyptus in Australia.
Considering that Pretty Serious Cosmetics is an Australian brand, this plant is probably what they’re referring to. Still, I like my idea of chattering teeth because it brings to mind those little wind-up toys that are both amusing and creepy.