The innate ability to discover images within images or scenes is basically what Pareidolia is, and its basically what ink blot tests are used with.
There were a lot of hidden things I saw while playing Pokemon Mystery Dungeon Blue Rescue Team, and I turned some Friend area assets into trainers. A few of them were accidentally referencing other pokemon like Brionne and Cyndaquil til I finished and realized afterwards lol. These were really fun to do and making human characters were a nice break from creatures and such.