I'm looking for a way to implement custom item sprites in my vanilla world. Is there a way to, say, add a custom sprite to a resource pack and then call that sprite with a command block? I want to be able to have custom items, armor, and blocks that don't look like the generic versions from the resource pack.
Hopefully there is a way to do this with command blocks, perhaps by defining some data tag I'm not aware of when doing a /give command?
Any help here would be greatly appreciated.