What if I don't want to animate my particle, but still want the ability to load it's single image from URL?
You wanted a use case:
Say you have a platformer where you can have a floating companion, which emits particles when it floats around. You can unlock new particles for that companion, without having to regenerate the game's spritesheet - super useful for when you want a special "christmas edition" or similar.
@Ashley - why don't all objects that display an image have a "load image from URL"? Sounds like a nice case for standardizing, as that same use case could be applied to everything.