yourATCstore Christmas Children ATC Collage Sheet. These vintage images are 2 1/2 in. x 3 1/2 in. featuring 9 different Christmas Artist Trading Card Images. Great for Christmas Artist Trading Cards, greeting cards and more. This collage sheet was professional printed to bring out the best in clarity and colors. The collage sheet measures 8 1/2 x 11 and comes in a clear protective bag.