from slide 77, Sarah Grissom’s part is all about photoshop tricks for VFX.
For this sort of textures, the radial blur in photoshop is your friend.
(Can’t look at substance right now but I bet they’ve got similar tools)
Start from a fireworks / sparky texture for instance, apply different levels of radial blur in zoom mode, mix and match and voilà!
You can also just start from a few dots but I tend to like using pictures as a base because it gives you more details.
This texture for instance was created using a mix of radially blurred images, it is kind of similar to Silver’s texture:
These as some of the layers that make it up. It’s a case of simple add of multiply blends between layers, and some levels here and there. And every single one of these layers have been radially blurred as a start.