Lots of people know I begin each of my artist's journals with some kind of illustration of my palette. Lately, I have used the last page as a place to collect memorable quotes or thoughts. These are usually gathered over a period of time, so they are generally scattered in a hap-hazard fashion.
I've also seen a journal artist using the last page or two as a calendar, drawing in the calendar themselves with a splash of color or tiny motifs. Maybe I might try that in the future, if the journal has lots of pages.