Layered cocktails, where the different densities of the ingredients enables a beautiful layering of liquids, can make any occasion much more festive. The challenge is to find ingredients that both pair well together and also differ enough in their densities to create layers. Generally, the higher the sugar content, the higher the density. You put the liquid with the highest density in first, and then follow with liquids of decreasing density. Usually, simple syrups on the bottom, followed by liqueurs, and then the spirit or soda water.
Although any clear glass will do, you want to choose something that displays your layers the best. This may take a little trial and error on your part.
Because I want to make my drinks for Christmas, I chose ingredients that not only look “Christmas-y,” but also have flavors reminiscent of the holidays.