Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"K",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"91ef7753-a4c5-37c9-ad5d-70e81b6d526b",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvOTQ2MWIzOGM4ZTQ1NzgyYWRhNTlkMTYxMzJhNDIyMmMxOTM3NzhlN2Q3MGM0NTQyYzk1MzYzNzZmMzdiZTQyIn19fQ=="}]}}}

API Usage

GET https://headdb.org/api/head/91ef7753-a4c5-37c9-ad5d-70e81b6d526b

{
  "name": "K",
  "uuid": "91ef7753-a4c5-37c9-ad5d-70e81b6d526b",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvOTQ2MWIzOGM4ZTQ1NzgyYWRhNTlkMTYxMzJhNDIyMmMxOTM3NzhlN2Q3MGM0NTQyYzk1MzYzNzZmMzdiZTQyIn19fQ==",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/9461b38c8e45782ada59d16132a4222c193778e7d70c4542c9536376f37be42"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"K\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"91ef7753-a4c5-37c9-ad5d-70e81b6d526b\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvOTQ2MWIzOGM4ZTQ1NzgyYWRhNTlkMTYxMzJhNDIyMmMxOTM3NzhlN2Q3MGM0NTQyYzk1MzYzNzZmMzdiZTQyIn19fQ==\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/91ef7753-a4c5-37c9-ad5d-70e81b6d526b