Kyouei's Balloon Lamp is a simple and inspired object. Arguably just a latex lantern sans cord, the Balloon Lamp could become so much more. Modified with a Lithium-Coin battery, the illumination provided by the LED can last up to 100 hours. Now imagine substituting the breath used to fill its volume with helium. You'd have a floating, ghostly orb perfect for stringing around a pool during a summer party. Alternatively, (environmental concerns aside) I'd definitely want to see thousands of these set loose on a still night. White fireflies on a macro scale.
Via Sensory Impact
Related: AfroditiKrassa's World View Lamp which will be put on the market by Innermost.