Don't worry, this is not a replacement for inkblots, but every once in awhile I get a bad case of the "pareidolias" and I thought maybe a small diversion from ink wouldn't be too bad.
One of my old nemeses, popcorn ceiling, seems to be prominent in a lot of medical waiting rooms. At first it was a nice way to pass the time while waiting semi-naked for the doctor, but if one is particularly fevered, the images that pop out tend to be...weird.
I am sure the majority of people will not see anything, but if you have a few minutes, just stare.
As always, bonus points for drawing/outlining anything and sending it to firstname.lastname@example.org