As I told before, you could use any stuff for creative lovely bed for your flowers. Just be creative and do it.
The creativity is already here and we give to you for free. All you need to do is to see the images, to find the material you need and to do this for your outdoor place.
I am sure that this will be suitable for your outdoor place. Plant a lot of flowers, plant a lot of green threes and nature will be grateful to you.
We need nature to be happy and we need gardening for living long life. Take care for your garden and make the most u=out.