Glad you asked.....! A flat art cake is a normal shaped cake, such as round, square, rectangle or heart, with a piece of artwork done as a flat chocolate "panel" on the top....or even on the sides. This artwork is generally the most inexpensive, but it is still quite striking and appealing. Larger pieces that require more colors and details are much more expensive than simple pieces, such as cartoon characters. Portraits from photographs and highly detailed pictures are the most expensive.