minecraft-assets/assets/minecraft/blockstates/green_concrete_powder.json

{
  "variants": {
    "": [
      {
        "model": "minecraft:block/green_concrete_powder"
      },
      {
        "model": "minecraft:block/green_concrete_powder",
        "y": 90
      },
      {
        "model": "minecraft:block/green_concrete_powder",
        "y": 180
      },
      {
        "model": "minecraft:block/green_concrete_powder",
        "y": 270
      }
    ]
  }
}