Just saw this article about a camera that has been designed that uses solar energy to power itself, meaning it can theoretically run forever. I think it’s pretty cool and have already been thinking of useful and interesting ways that it could be used. Although the resolution at present is quite poor, once the amount of power that can be harnessed increases as solar technology improves, the camera may be able to take decent quality pictures. This could be a great security device, or even just as a historical documenting camera that can be placed outside and take pictures of an area over a long period of time, many years, allowing people to have a time lapse of their home town or city as it develops.
For more check out the article here: http://www.bbc.co.uk/news/technology-32353655
As always, let me know what you think in the comments here or on my facebook page