yourATCstore Halloween Witches, Cats & Bats Collage Sheet. This is full of vintage Halloween cards with witches, black cats and bats too. These are very colorful images! Perfect size images for ATCs and other Halloween cards and projects. This matte finish collage sheet is professionally printed and comes in a crystal clear bag for protection. Each collage sheet measures 8 1/2" X 11" and is acid free.