ThisRocks/src/main/generated/assets/rocks/items/starfish.json

{
  "model": {
    "type": "minecraft:select",
    "block_state_property": "variation",
    "cases": [
      {
        "model": {
          "type": "minecraft:model",
          "model": "rocks:item/starfish_red"
        },
        "when": "red"
      },
      {
        "model": {
          "type": "minecraft:model",
          "model": "rocks:item/starfish_pink"
        },
        "when": "pink"
      },
      {
        "model": {
          "type": "minecraft:model",
          "model": "rocks:item/starfish_orange"
        },
        "when": "orange"
      }
    ],
    "fallback": {
      "type": "minecraft:model",
      "model": "rocks:item/starfish"
    },
    "property": "minecraft:block_state"
  }
}