I decided to make my old Dell (now a linux box) some bling(ish) so I grabbed some LED's, a switch, a terminal block, and some wire, a molex, and some resistors. You only need one (value depending on 12 v or 5 volt--I had 6 because I did not have a correct value) Very simple mod, but soldering skills were required. I just hotglued the LED's to the front panel of my case, and drilled a hole for the microswitch. A $10 mod that is very simple and looks very good.
Step 1: This Is the Original Computer
This is the original computer. Any computer will work, but the grille in this computer is perfect for invisibly making it glow.
sorry for the sideways--just turn yer head