Marmite is a poor substitute for vegemite.
In a place called Kanazawa on the coast of the Sea of Japan, they sell tea with gold leaf floating around in it. Its Japanese tea, obviously, which comes in a variety of flavours, and is generally quite nice, but the gold flakes get stuck in the back of your throat. A bit disconcerting to think that it will enter your digestive system.
The best tea in the world, if you like green tea, is tea from Uji outside Kyoto (the same place with the world's oldest wooden building).
None of this stuff comes in bags, incidentally."
