yourATCstore Back to School 2 Collage Sheet. This has some identical images as the Back to School collage sheet, but with some different school images added, and even some ABC books. Perfect for school ATCs, altered art projects for teacher gifts, children's school scrapbook albums and more. Perfect size images for ATCs. These matte finish collage sheets are professionally printed and comes in a crystal clear bag for protection. Each collage sheet measures 8 1/2 in. X 11 in. and is acid free.