Purely my opinion but I think the pic looks like something is started but not finished. Nothing is attached to hang it. All of that empty space around the ball seems to be begging for more plants to be added.
I'm sure there are different balls with different stuff in them out there, so it may not be possible to generalize much, but the pictured ball looks similar to the orchid balls that I have. Is the term "kokedama" used just for moss-covered balls of soil, or is it correct to call a moss-covered ball of something else "kokedama?" What if there is no moss?
That stuff aside, this is so weird! WHAT is in the air? Just this past weekend, I was looking at 2 moss-ball orchids, wondering why I've never added more. More stuff to dangle over the sides and take better advantage of the vast amount of space available from under the leaves downward. I would try any succulent plant this way. I stuck a little rosette of Grapto-something in there because it was already in my hand looking for a home. This weekend I have planned to put more stuff in there, definitely some skinny Rhipsalis, probably some Callisia (this one
Striped Inch Plant (Callisia gentlei var. elegans) ), probably some Sedum (this
Petrosedum rupestre ).
These orchids are so happy, I've never disturbed them to find out what is going on in there but what I can see is some wood chips, a metal outer frame covered in moss, wrapped in twine. There could be some soil under a layer of wood chips but not much, gauging by the weight when soaked. These things dry incredibly quickly. it's been tricky to dunk and spritz them often enough to keep the moss green. (At least 2x week.) So it seems logical that succulents would also dig it.