These are some paper toys from the anime "The Grim Adventures of Billy & Mandy". They are designed by Javier Esteban Canteros. The Grim Adventures of Billy & Mandy often referred to as simply Billy and Mandy is an American animated television series that aired on Cartoon Network. It is also the spin-off of Grim & Evil. Having originally aired as part of Grim & Evil The show began in 2001, And went on to become one of Cartoon Network's longest running shows.
Featuring the voices of Greg Eagles, Grey DeLisle, and Richard Steven Horvitz, the series stars the two main characters, Billy and Mandy, having manipulated the Grim Reaper, usually called "Grim", into being their best friend for eternity after having won a bet over a sick hamster through a game of limbo.
You can download these papercrafts from here: The Grim Adventures of Billy & Mandy Paper Toys Free Download