I made a 3-LED by-Android-controlled Arduino application.
I used the HC-06 Bluetooth module, bought from Alibaba.
The arduino and LEDs are pretty standard.
For the app I used the incerdible online MIT App inventor application.
The hardware is pretty simple. You'll need some LEDs, I used 3 of different colors.
The connections are as followed:
pin12 --[orange]-- greenLED+ --- greenLED- --- 220OhmsResistor --- GND
pin13 --[orange]-- blueLED+ --- blueLED- --- 220OhmsResistor --- GND
This application will be onedirectional: APP --> Arduino, so the 6th connection is not needed.