You might wounder why this is better than a normal die. It significantly increases your geekiness level.
The biggest part is the battery, because we're using a 9V battery.
Step 1: Parts
You will be surprised by the number of parts needed:
-7x LED (preferably diffused)
-7x 160 ohm resistor
-9V battery clip
This part is for the voltage regulator:
-1x 60 ohm resistor (power rating 0.3W or more)
-1x 5.1V zener diode (power rating 0.5W or more)
Sadly, I never take pictures of my parts. I always forget.