The strange and curious. Dali-inspired photos of cantaloupes floating in pickle jars or a dentist stuffing candy down his or her own throat or Oscar Wilde look-alikes singing karaoke to Cemetry Gates... though that would be difficult to capture in a photo.
i.e. - The avoidance of pics involving flowers,hands or feet, lone park benches, sunsets or silhouettes of people holding hands on a beach, etc. ad infintum and ad foreverum, would be ideal - but certainly not mandatory.