When you for example, give a card for a Shopping Spree at a particular shop or mall, make sure the shopkeeper accepts the card, otherwise the recipient cannot use his/her gift. 

You can do so by paying the amount your are planning to give in advance  to the shop, thereby ensuring that the coupon is paid for and the recipient can shop for free up to the amount as stated on the gift coupon. Make sure you get a receipt or some other proof of payment!

Alternatively, you can buy an original gift card from a store or other place and insert this in your printed card.

With a gift card for a Night Out to the Theatre, to name another one, you can buy or reserve tickets for a show that the recipient has been wanting to see, and then either include the tickets with the card, or have them pre-booked at the ticket-office at the theatre. 

With a gift card for a Dinner For Two, you can make a reservation at a favorite restaurant and give the card as tangible gift to the recipient. 

There is no end to the ideas you can come up with! Use your imagination and have a ball!