Here is an idea of what we have done with our postcards (since we have too many for our pin board) We have also made the folder pretty by using photocopies of all the stamps and gluing them to the front, and then putting glue over the top.
I love this website. I can refer back to it in a pinch when looking for a quick project or activity for the community members I work with. There are plenty of tips, as well as instructions for the activities which are so helpful.