Use white face paint and this scary clown make up set to turn yourself into a terrifying clown.
You get the eye markings, some stars, red tears of blood, black arrows and the mouth tattoo which has vicious teeth. You only need water to apply it like a normal temporary tattoo.
You just need to make up your own eyes as usual, perhaps with a nice bit of liner.
Tinsley Transfers specialise in making reaslistic temporary tattoos. Remove with baby oil. Avoid Eyes.