I can’t think of any that my parents started, offhand, so I’ll share one that my uncle started.
My grandparents had 4 ceramic candleholders that they put out every Christmas. They looked like chiorboys, and each one’s book had a letter on it. Put together, they spelled N-O-E-L. They had these for as long as anyone can remember. When he was a child, my uncle began to rearrange the chiorboys to read L-E-O-N on the day after Christmas. Since the 26th was their anniversary and they would host the first of the “week after Christmas visits”, my grandparents routinely failed to notice the change until it was pointed out by a guest, but no one knew who the prankster was. Every December 26, without fail, the choirboys would mysteriously rearrange themselves. My grandmother was a bit of a neat freak, very organized, and while she took it in good humor, she was just a little miffed that someone would rearrange her stuff. She’d laugh in spite of herself, though. Story goes that no one had any idea who was behind it until my uncle admitted to it years later. He still continued to do it out of habit and to give my grandmother a little nudge every year until she passed away and I bought the house.
While going through their items, I found the candleholders and gave them to my uncle. “They belong more to you than they do to the house,” I told him, and he was touched to have them.
That Christmas, the family gathered at his house, and it was a bit sad, since it was the first Christmas without my grandmother, his mother. Since it was also his and his wife’s first Christmas in their new house, many of us were seeing it for the first time, and he gave us the tour. Proudly displayed on the mantle in the living room were the four candleholders in a row, N-O-E-L, just like they had stood for the last 40 or more advents.
After dinner, everyone mingled off to different rooms to relax and digest, when a loud belly laugh was heard coming from the living room. My uncle and grandfather, tears in their eyes, were standing in front of the mantle, laughing at the sight of four ceramic candleholders, standing in their annual post Christmas formation, L-E-O-N, knowing that the tradition was in good hands.