Yar i did one a while ago
I modded my Casio CFX
Basically i did a front light with white led's, illuminated its on/off switch with a blue led and added a mercury tilt switch for the exe button
Video:
http://www.videopwnage.com/play.php?vid=107The video was actually done in the premature stages of the mod
i ended up doing a proper plexiglass front light that spread accross the front of the screen like a GBA SP one
and adding the blue led's to the switches and added another switch to turn off the tilt if i needed
Needless to say dude, it makes you the envy of your maths class