The Flexio is aptly named, as this design concept by Wu Kun-chia, Wang Shih-ju, Chen Ming-daw and Liou Chang-ho offers a flexible form factor that is all powered by a solar cell. "What do you need that solar power for," you ask? For FM radio listening!
Our wallet isn't actually large enough to carry one of these, but they do seem purse friendly. Ideally, the design would be modified to be a wallet itself, with speakers within and the solar panels as the exterior. We'd want Wu's C.R.E.A.M. to play every time our wallet opened...remember, you read it here first (yes, it will be as annoying as those greeting card that play music when opened).