The official Adventure Time Facebook page uploaded a whole bunch of fan art, and this was one of them, and this one is my personal favorite. It shows Finn resting on the new willow tree with the Finn sword stuck on it. It shows how Finn is relaxing from all the adventures he had through out the series, and is trying to take it easy for a while. I can imagine this fan art to be an idea for a future episode of Adventure Time (of the series didn't end, which it did) for Finn to sit next to the Finn Sword.
This was made by, mimi saurio