Bukkit

Could you please add support for custom heads without assigned active player account. Since version 1.8 it is possible to generate heads, which just include the path to the texture file on the Mojang servers.

This has several advantages over player heads:
1) The files are never deleted or changed and therefore the textures do not change.
2) For custom 1.8+ heads one has much more choices. Some websites and plugins are specialized in this.

A give command for a custom skull looks like this:

/give @p minecraft:player_head{display:{Name:"{\"text\":\"Orange\"}"},SkullOwner:{Id:"1b9b28c5-9d06-4b69-934c-515b29f2e632",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNjViMWRiNTQ3ZDFiNzk1NmQ0NTExYWNjYjE1MzNlMjE3NTZkN2NiYzM4ZWI2NDM1NWEyNjI2NDEyMjEyIn19fQ=="}]}}} 1

So it would be cool if you could specify the ID and the link to the texture instead of the player name in the command.yml. Support in the generateiconmenu command would make it even easier.

If you want to learn more about it, I recommend the following website:
https://minecraft-heads.com/
It contains over 10000 example heads, extended explanations and a generator.