Leisure Arts Artist Trading Card Collection Babies & Children. ATC cards & collage ATCs made easy. Create art with ephemera papers using Leisure Arts baby and child themed ephemera packed art papers. They're exactly the right 2 1/2" x 3 1/2" size. Just trim, mix, match and produce the ideal little work of art for Artist Trading Cards or for any papercrafts project. Perfect for ATCs, greeting cards, scrapbooks, collage pieces, and more. A total of 40 pages, 2 pages of each image. Acid and lignin free. Photo safe.