Since I'm an art teacher at two schools, one for a semester each, I planned to just repeat the lessons that I did the first semester in the second. I'm always finding such interesting new lessons, so I ended up changing quite a bit anyway. Some lessons I changed just because of time of the year (Van Gogh sunflowers didn't really fit in February.)
Last semester, they printed on white paper and just left the clean print. This semester students printed on construction paper (I had plenty of construction paper, but not so much white) and then added a background. I loved some of their creative ideas. I've seen others add the background first, but I liked to have the students totally in the dark about the fact that we were printing with fish.