I love herbal teas. I currently have peppermint, lemon ginger, lemon zinger (which I think is actually lemongrass) and chamomile open at home. In the fall I like warmer flavors like apple cinnamon. Peppermint is all year round, though.
I have a whole cupboard of teas - black, green mostly english and Indian with a bit of japanese thrown in for good measure. Then the herbal teas - mint, chamomile, dandelion, and then the medicinal blends.