A slutty cactus - if a million pricks is what you desire

A minecraft turtle - If you want a cheap, yet fun costume that's easy to make

A nail - If you want to get hammered and/or nailed

Satoshi Ninjamoto - If you want to be cool

A fridge - If you want to be cooler

Ice Cube - If you want to be the coolest

The Michelin (wo)man - if you have access to a lot of tires

Manbearpig - if you feel like it

A snail - If you don't feel like leaving home