yourATCstore Cowboys and Indians Artist Trading Card Collage Sheet. This cowboy and indian themed collage sheet has many different sized images to fit perfectly on your ATCs. There is also 3 - 2 1/2 in. x 3 1/2 in. ATC backgrounds on this collage sheet. 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. Each collage sheet measures 8 1/2" X 11" and is acid free.