It does seem an odd thing to do, but I would hang onto your original lights if I were you.
You ought to be able to buy a set of standard lights for not too much money, but it will really devalue your car when you come to sell it if you don't have the original lights to refit.
Personally I don't get it. Even with xenons and LEDs, the GTI isn't exactly a "look at me" sort of car. Most go unnoticed, even by people that think they know about cars.