You have to buy or get a free skin. There are different kinds of creeper skins. One with a suit, a regular one, and different kinds. They don't explode. ( Or at least, I haven't heard of one that can explode.)
creapers are things that blow up in minecraft. they are a bug from a pig
creaper
This is not the place to find out about Minecraft. Look at the Minecraft Wiki to find out about the game in general.
You can find it at the minecraft skindex
There are no rabbits in vanilla Minecraft.
You can find Minecraft gifts and other products directly at the Minecraft website. You can also check online shopping sites such as eBay to find merchandise from Minecraft.
minecraft classic and minecraft beta singeplayer, all on minecraft.net
In vanilla minecraft there are no endermen bases.
Minecraft PE 0.8.0 does not have squids in it.
Modloader can be found in the modding section of the minecraft forums.
You can find glowstone in the Nether.
You cant find a giant mob in vannilla minecraft but you can sumon him using a command or a spawner.