Step 1: Parts list
1. A classic Star Trek phaser - around$25 on eBay.
2. A BlinkM smart LED - made by ThinkM and available from many sources. I got mine from the Maker Shed Store for $12.95
3. An Arduino controller if you do not have one to program the BlinkM. I got the Arduino Diecimila from the Maker Shed Store for $40.
A 2-pin wire connector with leads, like you would find on a PC fan power lead.
Hot glue gun
Shrink tubing or electrical tape