There are seven images of the couple for sale on the website SaatchiArt.com, which range from $US250 to $30,000.
Artists can upload their work and if it sells they receive 70 per cent of the price, while the site receives 30 per cent commission.
Saatchi, 71, who is reportedly dating Trinny Woodall, doesn't seem to concerned about the artworks appearing on his site.
"Would it have been a better story if I had censored artists whose work might be personally disobliging?" Saatchi told The Mail on Sunday in an email.
In June last year, Saatachi was photographed with his hands around Lawson's throat as they dined at Scott's in Mayfair, London. Seven weeks later the pair were divorced.