The tea pillow idea scares me a bit. Microbes love decaying plant matter, so you'd have to dry your spent leaves really really well. It could probably be done successfully, but I don't think it would impart any real health benefits...and it would probably be very uncomfortable to boot!
himthatwas once posted on his (defunct?) blog something about using spent leaves in the bath.
It looks interesting.
I'm more partial to throwing my leaves in the compost. There just ain't enough hippie in me.