It is definitely a beautiful quilt and I am sorry to say that it is not mine. I wonder if one could make the blocks like HST's. Looking more closely at the photo, it seems there are two repeats of each colour combination. That is what brought the HST idea to me. If I was making it, I would make the center of each block as an HST, and then miter the border on each block.
I made something similar several years ago, using this pattern:
https://storyquilts.com/products/magic-squares. I'm sure it is somewhere here in Pictures.