Another doodle idea made at work and taken too far in what comes to time consumption: two squares, each with 4 corner “ears”, each of those being either in or out.
53 possible combinations considering relative position between the 8 ears (the criteria for uniqueness is that no piece can be matched by simply rotating or mirroring any of the others). | 
Nice, very interesting.
You should try do a big pattern with many animated ones