We spent a couple of years, maybe 5 or 7 years ago, trying straw bale gardens.
It was quite interesting. I would recommend giving it a try some time. You can do it even with just one bale. We did it with about 10-12 bales of oat straw from a farm we knew.
E.g., https://www.amazon.com/Straw-Bale-Gardens-Complete-Karsten/d... was the author of the book we used, though this seems to be an updated version to the one we used.
I prefer raised soil beds, but this straw bale style was quite enjoyable.