Big title for a small piece of art! Art cards are small format, miniature works of art. They are paintings, drawings, collages, handmade prints, altered art, assemblages… they come in most any medium, in any style, from anywhere in the world. And they all have only one thing in common… art cards are 2.5″ x 3.5″ (64 x 89 mm) in size, just like baseball (and other sports) cards.