Yes, I said 'no' maintenance! MOSStile available through Benetti Stone uses lichen on an eco-resin ready for install. There is no watering, fertilization or pruning required, which is perfect for those who are green thumb challenged. About the only requirement is a humidity level of 50%. The lichen is available in 12 different colors.
For someone like me (who likes to preserve energy...yeah I spin it, lazy makes it sound like it's a bad thing) MOSStile sounds like a fantastic alternative. Just think, if you do a wall in your shower...one less wall to wash!
I've wanted to do a green wall outside at the front entrance to our house for some time. I would love to see if the MOSStile stands up to our winters; it should, lichen grows in the Arctic.