Particle/Material experts, help please?

Hi! I’m trying to create a particle generator in my game that picks from more than one image. Ideally it would pick one image at random. I don’t really know how to approach this. The images are different sizes, so it ruined the approach that I was thinking of doing, which was the creation of a material using sort of a spritesheet and utilizing the SubUV function in Cascade.

Is there any way I can have the particle pick randomly from two or more materials, or something of the like?

Thank you!