Why would only humans make use of eco-friendly technology? OOOMS designed a birdhouse with a solar panel on it's roof. During the day sunlight feeds the solar panel, charging a small battery inside. At twilight the transparent stick will light up and cast a tiny light on your garden. This light attracts an easy nighttime snack for the bird; all she has to do is stick her beak out of the hole and wait for the buzz.
I've never been a huge fan of Petrachi's robots. Although I know he creates most of his robots from things people throw away, I am just reminded of Toy Story everytime I see his creations (Petrachi), which gets me really upset. Well, except for these.