Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"J",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"de25a7f7-74ca-32b7-b296-a2178b8e71cf",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvM2E3OWRiOTkyMzg2N2U2OWMxZGJmMTcxNTFlNmY0YWQ5MmNlNjgxYmNlZGQzOTc3ZWViYmM0NGMyMDZmNDkifX19"}]}}}

API Usage

GET https://headdb.org/api/head/de25a7f7-74ca-32b7-b296-a2178b8e71cf

{
  "name": "J",
  "uuid": "de25a7f7-74ca-32b7-b296-a2178b8e71cf",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvM2E3OWRiOTkyMzg2N2U2OWMxZGJmMTcxNTFlNmY0YWQ5MmNlNjgxYmNlZGQzOTc3ZWViYmM0NGMyMDZmNDkifX19",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/3a79db9923867e69c1dbf17151e6f4ad92ce681bcedd3977eebbc44c206f49"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"J\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"de25a7f7-74ca-32b7-b296-a2178b8e71cf\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvM2E3OWRiOTkyMzg2N2U2OWMxZGJmMTcxNTFlNmY0YWQ5MmNlNjgxYmNlZGQzOTc3ZWViYmM0NGMyMDZmNDkifX19\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/de25a7f7-74ca-32b7-b296-a2178b8e71cf