Today I used SainSmart 8 Channel DC 5V Relay to play around. This relay is very easy to use with Arduino / Raspberry Pi.
To play around with the BLE shield I used the iPhone app and the Arduino code mentioned on their website. You should be able to follow the instruction and design your needed circuits to control. In my case the final setup looked something like this
Small video demo to see the above setup in action
Stay tuned for more updates as soon as get time to work on these exciting projects