They are VERY easy to make. They are the backs of plain dominos. I then use rubber stamps (a couple of these are from Tim Holtz) and stamped the images in Stayz On permanent ink brown. Then I rubbed the sides in the same brown color ink to finish them.
How to create the patina effect using Distressed Paints and Distressed Inks. Going to also try this technique with other paints and inks by swiping the paper onto an inked/painted non-stick craft sheet.