Improved | Now you can use custom heads for menu items! Just specify "PLAYER_HEAD:texture link goes here" for your materials. The texture link MUST be a textures.minecraft.net link. You can pick heads from minecraft-heads.com which has over 43k heads to choose from! However, I must mention that the only menu item that can't have heads is the return button due to how the menu system with the plugin works.
Improved | Updated the library again to the latest stable version.
The release is also on GitHub like last time! Hope you all are doing well and enjoy the update!