The December challenge began a few years ago as a place to post holiday greetings, but that has limitations, and again, has been expanded to include the beginning of the new year, and to celebrate anything and everything that happens in that two month period--Christmas and everything else, and don't forget your personal events to celebrate at the end of the old and the beginning of the new.
And a Seasonal greeting for CM members might be your first presentation...
Remember the size limitations, you know...; use any process and source(s) you like. Do give us a hint as to your methods; and now---let's Celebrate!