Kathryn! Here are some ideas for you to achieve what you are hoping in this project. Good luck to you!
Hi Kathryn. You can use the pieces to build fairy houses, doorways, furniture, etc. You can even use the boards lengthwise as a fence for those fairies wanting privacy. Paint individual vertical lines to keep the stockade look going, or paint them to look like brick or stone. Unless the fencing is cedar, most will be treated, so wear gloves and don't use in an edibles fairy garden. Just have fun!
Here are some projects fellow hometalkers have done: https://www.hometalk.com/search/posts?filter=DIY%20kitchen%20island
If you have little people who like to play with the fairy garden, watch out for pointy pickets. And make sure you leave a big gate for little people to reach through while lying on their tummies. Have fun! ☺️