A number of people have moded the logo by putting a coloured film behind it. I guess it you don't ever want it to light up you could put some kind of light block behind the logo. Taking the screen apart is not an easy job!
if you cut a peice of thin plastic/vinyl and stick it over the apple logo on the outside, it can be done so its un-noticeable. It has to be cut to the perfect fit though.
Is there a way I can make my apple logo even brighter? Or bigger? Or maybe is there a way i can have it project an apple logo on clouds at night like the bat signal!!1!