Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"X",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"f811a80d-7f22-373c-9563-bd457afb4dfd",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvODM2MThmZjEyMTc2NDBiZWM1YjUyNWZhMmE4ZTY3MWM3NWQyYTdkN2NiMmRkYzMxZDc5ZDlkODk1ZWFiMSJ9fX0="}]}}}

API Usage

GET https://headdb.org/api/head/f811a80d-7f22-373c-9563-bd457afb4dfd

{
  "name": "X",
  "uuid": "f811a80d-7f22-373c-9563-bd457afb4dfd",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvODM2MThmZjEyMTc2NDBiZWM1YjUyNWZhMmE4ZTY3MWM3NWQyYTdkN2NiMmRkYzMxZDc5ZDlkODk1ZWFiMSJ9fX0=",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/83618ff1217640bec5b525fa2a8e671c75d2a7d7cb2ddc31d79d9d895eab1"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"X\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"f811a80d-7f22-373c-9563-bd457afb4dfd\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvODM2MThmZjEyMTc2NDBiZWM1YjUyNWZhMmE4ZTY3MWM3NWQyYTdkN2NiMmRkYzMxZDc5ZDlkODk1ZWFiMSJ9fX0=\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/f811a80d-7f22-373c-9563-bd457afb4dfd