I had a whole post written about my experiments with a rooibos-infused vodka, and the Internet ate it (drank it?).
So suffice it to say, rooibos tea is amazing hot in the winter—but even better in the summer, infused in vodka—with ice, honey simple syrup, lemon, and club soda. And it also works with orange, chamomile, and vanilla. And with orange and freshly grated cinnamon. And with wild hibiscus syrup. And Wódka Vodka is a fantastic value ($10 a bottle).