I have definitely considered doing a metheglin with something from Teavana...I don't routinely add tannins to my mead except in certain circumstances, but it can be a valuable addition at times. I would think that many of the Teavana teas would have less tannins than your run-of-the-mill black tea (many of the Teavana teas I've tried use white or green tea as the base...)
Packaged: Simple Cyser '14 (Nelson Sauvin Dry Hopped!), Spiced Cider, Spur of the Moment Graff
Primary: Falconer's Flight "SMaSH," Simple Cyser '15
Secondary: Why do I keep this line here...?
Bulk Aging: Cocobochet, Wild Cider (2014 & 2015)
Planned: Fruitcake Old Ale. Otherwise, so many ideas, not enough time to brew them....