I have used logs for practical raised vegetable beds. I also had some round shaped branches and the idea came to stack them and create a circular raised flower bed. I staked it with some broomstick handles while it settled. The planting was lavender and a flowering cherry tree. The tree grew from an off-shoot from a tree in my mother’s street. It wasn’t going to survive, so I saved, potted, and grew until I could plant out in a more appropriate place. Part of my guerilla tree planting.
Simple, rustic and good looking.