Just two simple pieces to put your brain on (https://www.printables.com/model/1032117-brain). I added it in the same category even though by itself it does nothing. I may snazz it up in the future, but probably not. The brain I printed (and the stand) will go to a neuro coworker and I will forget about it.
If you use Tinkercad and want to play with it, look for Brain Stand.
The author marked this model as their own original creation.