On the bathroom mirrors, and doors, hallways, doors on the stairways and in the stairways...but NONE downstairs, of course.
Some chapters have a committee that does them for particularly desirable PNMs. Or for towns where you need members. Or majors, or talents...etc.
I'll never forget the moment, early in pledging, I first saw a decorated rush poster under my Big's bed that read, Suicide ZZ. Suicide?! Whatever could THAT mean? She explained it was meant to pump-up the house for rush, but I didn't buy it until I was initiated and on the other side of rush.