this is actually really exciting!! now all we need to do is figure out how to accomplish this in a resource pack or some other client sided alternative that can be used in any server
all i know is that ive seen it done before with other blocks such as blocks of gold and using other textures instead of the end portal stars. im just looking for that effect that makes the texture move around when you move your camera. i would be able to recreate it entirely if i could get my hands on just that effect