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.
Step 2: Soldering It Together
You are free to use wires on the board, so that it is easier to connect the parts. Don't worry about how it looks, because you can/will put it in a "box". Although my "box" is more like a bag.
Step 3: Software
I had some problems changing the random number to a number between 1 and 6. The ciel function is just too strong for the little avr. Then I got an idea. I devide the number with 6 and take the remainder and increase it by 1. As you can see, it works :)
Step 4: Diffusing the LEDs
A good way to diffuse them is by using paper. You simply put it over the LEDs and it's done. I even made an entire enclosure with paper for that purpose.