Our last full day in Rome was packed full of things we had wanted to do on Christmas Day, but couldn't because they were all closed. Christmas probably isn't the best time to visit Rome, because it's a city that literally shuts down from Christmas Eve, all the way until we left on the day after Boxing Day.
We spent the morning in the Trastevere district of Rome. The Trastevere is west of the River Tiber, and south of the Vatican, so it was in easy walking distance from our apartment.
Church of Santa Maria in Trastevere - with a mosaic from the 12th-century of the Virgin Mary with Jesus surrounded by 10 women holding lamps