I think the general agreement is that Thanksgiving tastes like pumpkin, sage, nutmeg, and so forth. But Christmas is often much more personalized, given what is served and the traditions vary.
In my memory, Christmas tastes like the peppermint of candy canes, the candied red and green cherries picked off of a store bought fruit cake (sorry f.c. haters), and the dates, root beer, After Eights, provolone cheese, salami, and liverwurst sandwiches (not all together, a mix) and other 'nibblies' eaten at my grandmother's family Christmas party when I was young.
So, lots of mints and dried fruit and appetizers in my mind. What about for all of you--then and/or now?