yourATCstore Blast from the Past Retro Fun Ads Collage Sheet. You have to love the fun faces from old retro ads like these. This collage sheet has perfect sized images for ATCs, greeting cards, mixed media and collage projects (most images measure 1 1/2 in. x 1 1/4 in.). This collage sheet is professionally printed and comes in a crystal clear bag for protection. Sheet measures 8 1/2 in. X 11 in. Acid Free.