1.9.2
Added support for custom head textures through the plugin
Head Database and using the encoded texture properties string specific to a custom skull.
To use the Head Database hook, HDB must be enabled on your server and then all you will need to do is set the material to this format:
Code (Text):
material: 'hdb-<head id>'
ex:
material: 'hdb-4320'
For the encoded texture properties string (which requires no dependencies) it is a bit harder. First you need to travel to a custom skull site such as minecraft-heads.com or heads.freshcoal.com and pick the head you want, from there you need to copy the command which you can obtain the head with in vanilla minecraft.
Then put the command in notepad and select what I have highlighted:
From there you can paste the text below:
There we go, we have a world: