I love getting Christmas cards and hanging them up--I feel surrounded by friends and family. Often I wait until February to take them down. I used to carefully arrange the cards that my parents got and form them into the shape of a giant Christmas Tree--taking up the whole wall. I would build it day by day.
2nd favorite--fun old jewelry "vintage". A store that I really like but find incredibly overpriced went out of business. Paul went with me one evening even though he was sick to wait in the store as I went through the entire selection picking out some selected necklaces. Many of the necklaces came with clip-on earrings which I can't wear. I do not know how women ever wore them--they pinch your ears so. But an incredibly talented friend of mine took the clip-ons and modified them into modern hanging earrings. So many matching sets!