Go buy a $40 Soldering Iron, a spoll of thin rosin wire, a few leds, and some wire, and you can give your computer christmas lights.
Just make sure you have a resistor between the led and power supply. Or they'll burn out in a few hours. (The package the led comes in will tell you the voltage.)
You could also get a crimper and solder all the led wires into 2 (+ and -) near the end, Then crimp it and shove them into a molex you can steal of a spare fan. Then plug it into the Motherboards SysMsg LED or StandBy LED. That will be enough to power them, and you wont need a reisistor.