Monroville said:

Unlike the whole "red AT-AT windows and green AT-AT laser thing", the work on making the TIEs grey has already been done. It would be nice to at least have the option of a grey TIE version if it comes to it.

My biggest issue is mainly maintaining continuity with ANH. While I personally love the visual aspect better, I would rather have continuity continue than retcon ANH.

Even so, I've more than made my piece, so I will leave the "grey versus blue" debate and give the floor to someone else.

I think that it might be better to fit the intent of the original models used in this case. Just my opinion. However, I also understand the continuity thing with ANH.

Maybe, just maybe, we could postulate that the empire decided to add some blue paint/metal to the TIE fighters in order to make them more appealing for new recruits. I mean, there is nothing to say that ONLY clones could be pilots and that the empire didn't take on additional recruits. After all, which would you rather drive, a pure grey car or a bluish grey car if you had the choice?

I don't what the real story in the EU is for the change but, I like using my imagination. :)