This just an idea for a future feature.
Premise: On Linux is easy to switch color of entire desk to negative usign "xcalib -invert -alter" however this invert the whole desktop color
Would be nice to have the possibility to revert the color of only a particular window ( ... like some compiz plugin do).
I'm not sure where this functionality should be integrated ( maybe compositor ? )
I hope this helps make E17 better :)
p.s. If you wonder y ? I would like to revert the color of Netbeans because it doesn't have a nice dark color and the revert is perfect I would like to revert the color of Netbeans :)