Did you know that the Misfit Flash has an nRF51822 device at it's heart? I do. And when repurposed, they make great little devices for beacons, or temp monitoring, or acceleration measurement (via the built-in LIS2DH), or a single button remote, etc. Here are a few pics ... I'll try to include the code and pinouts (for the LED's / switch / accelerometer) at a later date. 
 
Anyone know why there is the symbol for "Sputnik" on the silkscreen? Just curious...