Color Changing Wristband Using Arduino

I am a beginner to arduino and electronics.
This is a prototype of a colour changing wrist band made by me . The RGB LED's Color and brightness can be controlled using any android device which supports USB (through OTG).
I used the following (android) app  and source code (for the arduino) .
Arduino Control RGB LED (Google Play)
Arduino Source code
The wiring diagram can be found with the source code.
The android device can be unplugged once the required color is set.
But to use the blink and fade feature of the app the device needs to be always connected to the arduino. 

I used an arduino uno which was quite big for this project. Even under the shirt, the on-board leds can be noticed in the dark. A smaller version of arduino (nano or micro) would have been ideal for this.

Its Working...!

Further i am planning to add an accelerometer to the setup to set the colour using hand movements.