comandos: 

 Esponja: /replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:sponge

Coweb: /replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:web

Yunque: /replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:anvil

Escalera: /replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:ladder

Slab: /replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:stone_slab

Cristal: /replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:stained_glass 1 5

/replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:stained_glass 1 1

/replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:stained_glass 1 2

/replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:stained_glass 1 3

/replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:stained_glass 1 4

Leaves: /replaceitem entity @e[name=killercreeper_55] slot.armor.head minecraft:leaves