yourATCstore Halloween ATC II with Black Cats Collage Sheet. This is full of vintage Halloween cards and inchie images of Halloween black cats. These are very colorful images each having at least one black cat in it! Perfect size images for ATCs and other Halloween altered art 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.