Quantity   Component name
1 × Arduino Uno Could really be pretty much any Arduino.
1 × Adafruit Triple-Axis Accelerometer+Magnetometer Board - LSM303 https://www.adafruit.com/product/1120
1 × Common Cathode RGB LED Common anode is OK, but requires some rewiring and reprogramming.
1 × Breadboard I used a Sparkfun shield-type unit, but that is not critical.
1 × Wires You'll need a few wires to hook everything up.
1 × Enclosure I got cute with mine, but all you need is something to hold it all together.
1 × Power Source I used a 9V battery with connector, but you can even use a USB power supply