I joined a realm server the other day with some friends and i happen to stumble across a multi colored patch of land, it was a snowy grass block patch on the side but strange colors that wouldn't normally be in the game in a plains type area, we could all see the patch and were confused, we could interact with it and pick up the blocks (they appeared normal in our hotbars but weird on the ground), we left the realm and joined back and it was still there. We aren't sure what happened to the textures but they are there.