Entity with random Texture when Spawned [1.12.2]

Hello, i was wondering how could I have my entity spawn with one of multiple variants of it's texture picked at random (textures already pre-made and in the textures folder). I've tried having a final random value on the entity class, assigned in entityInit, that dictates which texture to be picked later in the render class but, unfortunatly, that didn't work. Any sugestions? Any idea helps.