To mix up tea flavors, I will sometimes put two different tea bags in a teapot. For instance, right now I have vanilla flavored black tea and honey lemon herbal tea for a 1/2 caffeinated vanilla lemon flavored tea. Ha! You can do this with all sorts of flavors. Chamomile mint with jasmine green tea. Pomegranate green with herbal red sunset. Green with cranberry herbal. Earl grey with lemon zinger. Etc.
It's especially good in the evening or night when you don't want as much caffeine.