Artile is a new project on Kickstarter that aims to develop wireless (Bluetooth) 6"E Ink photo frames. The idea is that you can hang these frames in which you can change the photo that is displayed using your mobile phone. While these frames will most likely be hang on a wall at home (it will be easy to hand them, too), they can also be placed on your car, in restaurants, on windows - and wherever you like as there's no need for a power source (the battery should last for over a year).
This is a cool idea. If you like it, you can hop over to Kickstarter and support them. For $75, you will get one a kit with one frame and the required mobile phone software (and for $99 you will get housing and hangers, too). I hope this project will reach its goal, I helped a bit too with one early-bird backing...