There's a Kickstarter project called f.lens that I find interesting. It's a lens designed to focus the LED light on the back of your smartphone while you're using it as a flashlight. It sticks to your device via magnets, making it easy to put it on and take off—it also means it works with a variety of devices. We've seen a lot of lenses for photography, but this is one of the first devices I've seen designed to help light going the other way. The video below shows it in action. The company doing this did an earlier Kickstarter project that met its goal and shipped—they have details on this project's listing. Funding options that will net you an f.lens start at €19 (US$21.54).
Check It Out: f.lens on Kickstarter Focuses Your iPhone's Flashlight