Hey, this is my first mod!
Simply download, & install it as you normally would.
If it asks you to replace files, click yes.
This mod allows players to have a world full of white mobs basically.
Mobs that have been changed:

Creeper. Enderman.
Ocelot. Ghast.
Cow. Sheep.
Mooshroom. Pig.
Slime. Chicken.
Silverfish. Zombie.
Skeleton.

Bye! THIS MAKES IT A MOD: INSTALLING THIS, SHOULD INCREASE THE CHANCE OF FINDING SNOW BIOMES. PLEASE DO NOT SAY IT IS A TEXTURE PACK, AS THE CREATOR OF INVISIBLE CREEPERS MOD DID NOT GET ANY HEAT!!!