This concept is creative. You can use the back side of a pallet and paint it with black. This will be perfect for succulent plants.
This is one design you can get an idea from if you like to do it yourself. Create small bins for your plants about four inches thick. You can however, change a little from this design if you like.
If you have some extra beams at home, this is one idea you can innovate. You could hollow some portions to put in pots of soils. You can grow your favorite herbs in here