I don’t remember seeing these, here’s a talented street performer using them:
At some point I watched through a bunch of videos of solo artists doing this sort of thing. Some of them were pretty damn impressive at what they do.
There used to be a guy who did the foot drum thing here. I meant to go out and see him but didn’t make it before he died. Kind of a long strange story, but I ended up buying his super reverb after he died and then found out it was the same guy.