I can’t help but feel that this would be far more popular than palm reading, if it were to ever take off.

Out with friends and family at a major tourist location, looking to escape the heat during the afternoon lull. A small shop window with mystic anus(i/es) painted across the window.

With one of those glass balls and a good light source I bet you could make it into a collaborative experience. Comparing asshole creases and talking about life and your hopes and dreams.