I want to do what the title says.
I have a snow particles setup. Works fine. But I'd like to have multiple textures for it PER EMITTER.
Is this possible or do I just create multiple emitters?
Use multiple emitters. Cocos2d's particle system only supports a single texture per emitter.
In fact if I remember correctly a particle system emitter always uses a single texture in general, and effects using multiple textures always use multiple emitters. Clever emitters can use a texture atlas though and set each particle's texture frame, but again that's not supported by cocos2d.