Doors
and trapdoors.
Blast furnace GUI
All GUIs are unique!
Items
The items
Home sweet home
Some mobs
Some mobs yes
A house
in the middle of a yard
Villagers
With combination faces (i. e. noses are determined by biome, eyes and mouths by profession), all villagers within one village will have a unique look, but they will also look different in different biomes.
Blocks
All blocks, including Nether has been done!
GUI 2
Mobs
More mobs
Weapons
Weapons & tools