It's simple... Just change the name of determined item on the anvil and the magic will hapen!

The names you will have to use:

*Elytra;

-Angel Wings
-Bone Wings
-Charizard Wings
-Charizard X Wings
-Charizard Y Wings
-Demon Wings
-EnderDragon Wings
-Falcon Wings
-Invisible Elytra
-Iron Wings
-Legendary Wings
-Old Elytra
-Phantom Wings
-Rainbow Wings
-Tech Wings
-Wind Wings


*Armour
It works easely, just put that names in all parts of the armour(helmet, chestplate, leggings and boots)

(Iron and Diamond)
-Aqua
-Farran
-Flash
-Guardian
-Halo
-Pang
-Samurai
-Skeleton
-Soldier
-Spider

(Trinity Armours)
This works a little different of the others armours, because each part should be nammed differently, with a number 2 in the end.
Like this :

Iron Helmet - Iron Helmet 2

That works for ALL Trinity Armours(Iron, gold and diamond armours). So you can change the texture just puting the number 2 in his name.

(Exclusivity of the diamond)
-Deadric
-King


*Items
(Bow)
-Blaze Bow
-Bone Bow
-Cross Bow
-Diamond Bow

(Swords Iron and Diamond)
-Barbed-Wire Bat(it work for the wooden sword two)
-Bone Sword
-Ice Sword
-Master Axe
-Mummified Sword
-Samurai Sword
-Sickle

(Exclusivity of the diamond)
-Diamond Double Axe
-Diamond Sword 2
-Galaxy Sword
-Rainbow Sword

(Exclusivity of the iron)
-Iron Double Axe


And many new things are coming!
Have a nice adventure!