How to create a uni-texture model where view of block does not change as you rotate around it?

I am making a mod with a series of blocks that (I want to) look the exact same from all directions (Not only on exact north, south, etc. but from all diagonals as well, like an end gateway but without the particles or "stars") but I do not know how to code the model or shader in for that type of block. I have made most of the other blocks and all the other models that I (hopefully) will need. Can someone please help me with my last series of block models?

The only thing I can think of needing for this code is using a Custom Element, but I have no idea what code to put in to it.