I am happy to give anything a go if we can make it easy to join in with. The idea for the first day thread was that it would expire after the clock strikes midnight, and the original photos would have to be taken on that day.
Maybe the 12 days theme might need a little more time, but a variation on that theme could be the 12 days of French Car numberplates. ie pictures of french car reg 01, 02, 03 etc up to 11, 12.
Should be plenty around if members take their photographic devices on their exercise/shopping for essentials/work etc trips on December 1st.......
Could even tart up my "card" themed answer grid with the said 12 days traditional logos.