I too have a thing for seasonal dishes. I have a set of 4 Melamime dishes for Halloween, Valentines day, Spring/Easter and Summer. I also have my MIL's set of China with something close to 16 sets packed away in one of hte Rubbermaid dish chests they sold several years ago when Christmas dish sets became very popular.
So I made the big dish switch. Several years ago I decided the I liked having Christmas plates. Well,actually we got a service for 4 as a Wedding gift.
But then I acquired a set of melamine plates that were on sale the year I was to have Christmas at my house.
Then a year later I got some other dishes. Then a few days before Christmas they were selling for 50% off. So I got a whole set. Some Santa and some snowmen.