Wikipedia: "Artist trading cards [also called ACEO] is a conceptual art project initiated by the Swiss artist M. Vänçi Stirnemann in 1997. He called it a Collaborative Cultural Performance. Artist trading cards are 2 ¹⁄₂ by 3 ¹⁄₂ inches in size, the same format as modern trading cards"
They can be any medium on any support, so long as they are the correct size, and are regarded as 'affordable art'. They require the same skill as larger paintings, and sometimes take as long to paint.
I use mainly pen and watercolour, but also acrylics and oils on archival quality supports.
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