The 5"x7" banana bark collage compositions I made as product for the Maui Crafts Guild were popular. I used them to explore elements of composition as well as the materials' capabilities. Like a pianist's fingerings, they helped get my head warmed up for the big ones. I called them my "finger exercises."
I think the most I ever did were 75 of these things at one three-day marathon session. I was wiped out for days after that.