Having one blink out "Yes, sir! May I have another!" in multi-hued Morse code every time you insert a floppy would be awesome! 
On a practical level: analog circuit interpretation of speaker output for controlling brightness and hue might just work without additional processor time for the Mac or need for a MicroController.
For a Mac with stereo speaker output, that could be two channel variable music-mood lighting right the and there! }
Startup BONG!!!!!! would be VERY interesting that way.
jt = creature of the Analog/Neolithic Era . . . :-/
edit: bonus points for utilizing a readily available vacuum tube or three into the circuit! [] ]'>
On a practical level: analog circuit interpretation of speaker output for controlling brightness and hue might just work without additional processor time for the Mac or need for a MicroController.
For a Mac with stereo speaker output, that could be two channel variable music-mood lighting right the and there! }
Startup BONG!!!!!! would be VERY interesting that way.
jt = creature of the Analog/Neolithic Era . . . :-/
edit: bonus points for utilizing a readily available vacuum tube or three into the circuit! [
] ]'>