The phrase "the gift that keeps on giving" gets tossed around much too liberally these days, in our opinion. Especially because it so perfectly describes one very specific type of present: The Advent calendar. What could be more jolly and festive than a gift that, within it, contains at least a dozen sub-gifts, to be opened one by one every day? Whether or not you adhere to the religious significance of the days-until-Christmas countdown, there's been an undeniable boom in the Advent calendar market in recent years, whether your preferences lean towards beauty products, lollies, toys or high-end alcohol. Why not take advantage?