All zombies should have a normal Herorbrine skin, and zombie pigmen should have hooded Herobrine skins so they look like minions, and all zombie/zombie pigmen sounds shuld be ghast/wither sounds.

All peacefull mobs should have white eyes.

Gold ore should look like diamond ore, and diamond ore should look like coal but drop redstone upon being broken.

Diamond horse armor should look like gold horse armor and vice versa.

Tnt should look like sandstone, in case someone finds a desert temple, then wants to take the tnt from the floor trap. All this would make an awsome prank <:D .

invisable armour

hey i know! you could make pigs with white eyes so they are HEROBRINE pigs!

:D hahahahahahahahah dont forget to make apples look like dirt XD

Snaps Fingers. Got it. Make a uncooking furnace making look like a COOKING furnace!

Make TNT Netherack! When they go to light up the netherack it will explode.

Make zombies into a herobrine skin.

Their my suggestions.

Been there done that :/

make something new !

meh, it's been done before