How’s this for an idea? Take pictures of your D&D session (or Pathfinder, 13th Age, etc) and sell the prints online. This is what Brandi Miller Art is doing.
This photograph features a studio re-created D&D session so, I suppose, it’s more of a professional product than just something snapping a pic in the heat of the battle. That said; in-game photo taking can happen. I’ve done it myself, sharing the picture with the Roleplaying Games Google+ group. In my case it was an unexpected pistol on the table rather than a pile of dice.
Will anyone buy? I could certainly see a quality shot like Brandi Miller’s making an excellent picture for a gaming den’s wall.