Random design using a bath back scrubber as a starting point. I think it looks a bit like sea urchins with little feelers sticking out. Then again, it could be the inside of an alien spacecraft, or a sound deadening surface? Imagine this created in a 3d printer. What material, soft or hard, would it be made of? I could add paint to its surface to create a print, or use it to hold plant roots in… Imagination is fun.