I've experimented a bit using tea for groundcover. I picked up a box of cheap store-brand tea and it looks great as far as texture goes in HO. The only problem (if that's the correct term) is that it is quite dark. While I am aware that there are green teas, and white teas .. the cost of using those I imagine would be cost prohibitive. I'm going to dry bleaching the cheap stuff if I can find a source for Calcium Hypochlorite (Pool Shock) .. that's also a bleaching agent. In the meantime .. experimented with mixing the tea with white tempera paint and some yellow Rit. It actually came out looking great.