yourATCstore 1 in. x 3 in. Halloween Fun Microscope Collage Sheet. Great 1 in. x 3 in. Halloween images for Memory Glass Frames; no two images are alike! Use them on ATCs and other Halloween jewelry and crafts. This collage sheet was professional printed to bring out the best in clarity and colors. Each collage sheet comes in a crystal clear bag for protection. Collage sheet measures 8 1/2 in. x 11 in.