Id say a definite NO NO on this, always felt strongly about this, i have mentioned having mine completly restored and repainted, people and then asked "will you get it painted the same colour".. so i say Yes of course, just how it intended on leaving the factory.

No matter how good of a job it is, be expected to lose alot of interest from buyers in the car when you do decide to sell on. So many look for an escort cosworth as original as possible.
You would proba stand in at more money if you kept it the same colour.

As a few have said, its your car, do what you wish.