Here are some neat things I have seen online that uses postcards. Maybe it will inspire you for a gift for the postcard lover in your life (and it's okay if that's you).
There are lots of pendants on Etsy made from vintage postcards. I love that this one has the postmark on it, too. From Smokinmudproductions
Here is a pretty garland made from copies of old postcards. This is something you could make yourself or get from VintageScraps
This is an interesting way to use your vintage postcards. As a divider for a diy calendar. See more about this project on DesignSponge
Hope that gets you inspired. It totally gets me inspired. If you have any neat ideas for postcard crafts or postcard related gifts, please let me know. And if you need postcards or some unique stocking stuffers, please check out the shop. Thanks!