One 4 of the things I left in the Cottage that were welcomed by the new tenant were vintage aqua-tinted Ball jars.
They are just visible on the shelves above the microwave.
I saw a quick project to winterize these jars which is undoable and would not damage the jars in any way.
Pour some Epsom salts in the bottom of the jar (or in the lid if you have a conventional jar).
Add 1 or more bottle-brush trees.
If you really want to get fancy include a small snowman or plastic deer.
How easy and seasonal is that?
Have you got an easy project to share?