It is a great idea to dress up your gift certificate in a special box or in some other packaging. The reason is because it then looks more like a gift. It makes the giver look good. When buyers see that special packackage, they can imagine themselves giving it, and it making a splash with the receiver. So you are helping them out. It might cost more money, but since you generally make a lot with gift certificate sales because of the perceneforum.xxxe of people who don't redeem them, then you can afford to make them look great.
In the past we have put them in a silver pillow box with a bow. We would give the purchaser a choice of bow colors. We would display this packaging and let folks know it was free. Buyers where thrilled that they got such a nice package to give the gift certificate in.
P.S. Even Home Depot increased their gift certificate sales by offering them in a gift box.