to carry your analogy further CG, maybe it would be like respraying your car a different colour, and claiming that it wasn't a modification, as it didn't change the car itself. So whilst the police are looking for a red car, the bank robbers are driving a green car? 
I think you legally have to tell the DVLA if you change the colour of your car.
I think you legally have to tell the DVLA if you change the colour of your car.