Oh... I see, YOU are the thief. Stealing your own art and opening a Zazzle account to sell your own art so that Zazzle can sell its services with your art...
Could be coincidence, but if it does indeed randomly select images from its own database, yeah, I bet the images are tailored to some kind of keyword monkey business.
So thanks to Zazzle's investment in this technology, it has succeeded in advertising your own art to yourself. You should complete the circle and place an order of your own art.