In 2011, designers in collaboration with the University of Cambridge introduced us to the idea of mosses generating electricity (see references at the end).
I studied mosses in more detail as part of a university project to demonstrate additional benefits of these undervalued plants. As it happens, they are an excellent material for interior design. They work as insulators, exhibit anti-fungal properties, raise oxygen levels through photosynthesis, increase air humidity, and create a generally calming ambience. Not to mention, they are gorgeous to touch.
To exemplify these benefits, an extreme environment has been chosen: the aircraft cabin. One of few extremely cramped spaces we enter voluntarily. Research has demonstrated undeniably low humidity and increased CO2 levels in cabins. And flight anxiety can contribute to passengers’ discomfort. 
Mosses are photoautotrophs, which are easy to handle - they need very little soil and light, are resilient to environmental changes and in particular very dessication tolerant. All in all moss is little green powerhouse.
Air quality: becomes a peculiar factor in an extreme environment such as a flight cabin. Even in first class, where the leg-room may be be luxurious, but the air is still second class, as has been shown by an extensive body of research. Particular issues are increased carbon dioxide levels as well as uncomfortably low humidity. Under the right circumstances just a few hundred grams of moss can produce the entire amount of oxygen a passenger needs to breathe, thus increasing the quality of cabin air significantly. Plus, what is termed "plant sweating" would raise humidity levels.

: moss is fantastically calming to look at and rich and soothing to touch. In high-stress environments, a green interior can therefore contribute to an overall sense of tranquility. Most types of moss are furthermore practically non-allergenic.
And finally, electricity generation: Plant power might be the power source of the future, using plants' natural capacity to turn light and carbon dioxide into energy and oxygen through photosynthesis. Potentially the holy grail of sustainability. Although this technology will mature only in a few years, practical applications have already been demonstrated. And with the arrival of low-consumption gadgets, your laptop or screen may well soon be powered by a plant.
Concept: Fabienne Felder
Often perceived as some kind of a weed in the Western world, mosses have long been revered in Eastern culture - such as Japanese gardens. There they are grown and tended with care, as they symbolise a long life. Undoubtably, a feeling of calm and serenity emenates from those gardens. Depicted below, the famous Saiho-ji moss temple in Kyoto.
For demonstration of application of biophotovoltaic power by the University of Cambridge see:
For underlying research related to the University of Cambridge's project see:

P. Bombelli et al, Quantitative analysis of the factors limiting solar power transduction by Synechocystis sp. PCC 6803 in biological photovoltaic devices, Energy Environ. Sci., 2011, 4, 4690

A. J. McCormick et al, Photosynthetic biofilms in pure culture harness solar energy in a mediatorless bio-photovoltaic cell (BPV) system, Energy Environ. Sci., 2011, 4, 4699

Amongst many other articles, research on cabin air quality:
Hocking, M.B. (2002) ‘Trends in Cabin Air Quality of Commercial Aircraft: Industry and Passenger Perspectives’, REVIEWS ON ENVIRONMENTAL HEALTH; VOLUME 17, NO. 1
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