I had a canvas that was the right size, 12"x12"( it was dependant on how big I wanted the box to be). I added joint compound to the canvas in the shape of a tree and let it all dry. Then I painted the background, which I probably should have done first... after that was dry I painted the tree with metallics randomly. Using some scrap wood, I made the box and then added hooks and hinges.
And she loved it.