yourATCstore Artist Trading Card Collage Sheet - Brown. yourATCstore Artist Trading Card Collage Sheet with everything brown with vintage images and some animals too. This small brown themed collage sheet has many different sized images to fit perfectly on your ATCs. They will also work with your altered art, greeting cards and other collage projects. This matte finish collage sheet is professionally printed and comes in a crystal clear bag for protection. Sheet measures 8 1/2 in. X 11 in. and are Acid Free.