I saw something like in QB, a class someone was taking. I looked on Pinterest, and it's called shimmering triangles there, there are different kinds, but mine is mostly like
https://www.pinterest.com/pin/326299935482598816/ also exuberant color, the triangles project. I rarely ever use/buy a pattern, just make up something that I like from examples and when the size is correct, I go for it.