Do you record the month of December?
I have just found this Debbie Hodge class: Your December Story. I don't know what it is like but it may interest you.
The two most famous December diaries are Shimelle's Journal Your Christmas and Ali Edwards' December Daily.
And this is the one that I might do: Reverb 2013. Each day there's a question to answer that is related to events, thoughts and feelings during 2013 rather than a record of December & Christmas activities.
Whatever you choose to do I hope you enjoy it.