So more people are okay with Han Solo's pants changing from one movie to the next, but they want the TIEs to be all the same color, as if the TIEs associated with the Death Star are the default color for the TIEs in the rest of the galaxy? I think it's good that Han Solo doesn't always wear the same clothes (that could get smelly), and that the Empire doesn't always use the same paint job.
Point taken about the TIE Interceptor being a seperate instance from the TIE Fighters in ESB/ROTJ.
As for changing the color of the Executor... no, just no! We don't need to look to the video games to tell us how things are supposed to look in Star Wars.
Do we have to change things to make them all look the same? Basic consistency is one thing, making everything too bland and similar is another (like if somone wanted to remove all the color markings from the clones and battle droids in the prequels; or making all the lightsabers/blaster bolts the same color).
Variety is cool... anyway, that's my opinion.