Materials needed:
-----------------
1. Cheap translucent mouse
2. 1 Blue LED 
   (Radio Shack Cat. #276-311 $2.99)
3. 1 100 Ohm resistor (brown-black-brown 
   (Package of assorted resitors Radio 
   Shack Cat. #271-309 $2.99))
4. Soldering Iron 
   (Radio Shack Cat. #64-2070 $6.99)
5. Solder 
   (Radio Shack Cat. #64-025 $2.89)
6. Solder Wick 
   (Radio Shack Cat. #64-2090 $2.29)
7. Small Phillips Screw Driver
8. 1 HDD Light Motherboard Connector from an old 
   Computer Case
9. Wire Cutter/Striper 
   (Radio Shack Cat. #64-1922 $7.99)
10. 1 Volt Meter 
    (Radio Shack Cat. #22-802 24.99)

How we did it:
--------------
First off we we get out 
mouse and hook it up to the 
system (have the system turned 
off). We selected the mouse that
we currently had on a machine
that is located downstairs. It's
a A-4 Tech mouse that my father
picked up for pretty cheap.

Turn your mouse over and 
unscrew it.Our mouse had only
one screw to undo.






Take the top of the mouse off
and expose the pretty insides.







Click the pic to see a bigger
picture of the guts.







Take out the circuit board and
flip it over and locate the solder
joints where the wires connect from
the circuit board to the mouse 
chord.




Turn your PC on and pull out
your volt meter. Measure the
voltages between the solder 
joints till you find the +5v
and the ground on the circuit
board. We found out that our
circuit has +5 on pins 2 and
3 and our ground was on pin
4.
Here's a pic of our 5mm 5V Blue
LED that my father picked up at 
Radio Shack.









We hooked up the legs of the
LED to the +5 and GND solder
joints. Ain't that a pretty
shade of blue?



We pulled one of those
HDD light cables from an
old computer case face that
we had laying around. Snip
off the red (or what ever
color it is) of the end.
Snip down the legs on your 
blue LED and slide it in the
connector piece.
We bend the legs on our LED
so that it would stay in place
and make it easier to direct 
the light were we want it to 
shine.



Measure the cord length
so you don't end up with too
much wire in the finished 
product.





Turn your system
off and solder the 
red wire to one of 
the +5 solder joints.
Take your philips
head screw driver
and scratch off some
of the coating off 
one of the traces 
that connects to the GND. Make sure you don't scrape
off too much. Solder one leg of the 100 ohm resister
to the exposed trace and then solder the other wire 
to the other leg of the resistor. Check to make sure 
your don't have shorts with your solder work. Place
the circuit board back in the mouse housing and place
place your LED and position it in the direction you
wish it to shine. Then put the whole mouse back 
together but don't screw it together. Turn on your
system and make sure the system sees the mouse. If
your system doesn't, shut down then open the mouse 
back up and check for shorts again. You may need to
use a magnifying glass to find them. Once you get it
to be seen by the system, screw the mouse together,
turn the lights out and marvel at your glowing creation.