Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"O",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"3e04f3c2-7f2e-3cdc-9aa1-94933a8b6fb7",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvODA3M2JiNDRmOTM0NWY5YmIzMWE2NzkwMjdlNzkzOWU0NjE4NDJhOGMyNzQ4NmQ3YTZiODQyYzM5ZWIzOGM0ZSJ9fX0="}]}}}

API Usage

GET https://headdb.org/api/head/3e04f3c2-7f2e-3cdc-9aa1-94933a8b6fb7

{
  "name": "O",
  "uuid": "3e04f3c2-7f2e-3cdc-9aa1-94933a8b6fb7",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvODA3M2JiNDRmOTM0NWY5YmIzMWE2NzkwMjdlNzkzOWU0NjE4NDJhOGMyNzQ4NmQ3YTZiODQyYzM5ZWIzOGM0ZSJ9fX0=",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/8073bb44f9345f9bb31a679027e7939e461842a8c27486d7a6b842c39eb38c4e"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"O\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"3e04f3c2-7f2e-3cdc-9aa1-94933a8b6fb7\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvODA3M2JiNDRmOTM0NWY5YmIzMWE2NzkwMjdlNzkzOWU0NjE4NDJhOGMyNzQ4NmQ3YTZiODQyYzM5ZWIzOGM0ZSJ9fX0=\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/3e04f3c2-7f2e-3cdc-9aa1-94933a8b6fb7