The following images were drawn by artist Amy Zen to be used as labels for the site adagio teas, which makes it possible to blend custom tea mixes fashioned after your favorite characters.
Here's River Tam's flavor:
Floral, light and sweet tasting, with a bit of nuance in the rose flavour. Perfect iced on a warm summer day.
You can buy the Firefly ones at: Firefly signature blends by Amy Zen
Furthermore, this set is currently nominated to become a fandom sampler tea set, which means if it gets enough votes, you will be able to buy all blends together in 1 oz snazzy tins (with the art on them) that are reusable.
There's actually two separate Firefly blends in the running on the main page; the first one by Austin Browncoats is on top of the page while Amy Zen's set is at the bottom of the page.