This is a sparkle pattern that repeats.
I might make a brush version of this in the future, but for now this is an image material. You can use it as it is, or you can put the image material in, rasterize it, and erase the parts you don’t need! Here is a sketch of that being done.![](//assets.clip-studio.com/en-us/description/2105964/img/71532ea137-f746-21ac-7d42-85905e990b.jpg)
![](//assets.clip-studio.com/en-us/description/2105964/img/94f35d89b2-624a-70bb-989b-e9e545a88b.jpg)
![](//assets.clip-studio.com/en-us/description/2105964/img/eeca1b651d-2c4e-7f99-2fa1-be0105b268.jpg)
![](http://assets.clip-studio.com/en-us/description/2105964/img/71532ea137-f746-21ac-7d42-85905e990b.jpg)
You can also, after rasterizing it, change its color (What I did was use alpha lock and fill but there might be an easier way, I don’t know) and adjust to different blending modes to achieve cool looks (this one is yellow on an add layer)
![](http://assets.clip-studio.com/en-us/description/2105964/img/94f35d89b2-624a-70bb-989b-e9e545a88b.jpg)
Here is the pattern on its own:
![](http://assets.clip-studio.com/en-us/description/2105964/img/eeca1b651d-2c4e-7f99-2fa1-be0105b268.jpg)