My wife and I have been experimenting with making our own. So far, my favorite is chamomile, lemon balm, elderberry, and a little stevia.
I tried a new one last night that might take the lead with some tweaking: nettle, lemon balm, ginger, and cinnamon. Gotta get the proportions right, but the combination was pretty good.
Ah, we’re not quite adventurous enough to grow our own, but we buy the raw ingredients (aside from plantain, which grows wild where we live).