ACEO Art Cards, Editions and Originals for sale
ACEO stands for "Art Cards, Editions and Originals". The one rule is they must be 3.5 inches by 2.5 inches (or 2.5 x 3.5), the size of a trading card.
Below is my Art Cards for sale. They are all original and are signed on the back. They are £15 including postage!