My 5th grade students recently looked at some tree paintings by Piet Mondrian. The ones we looked at got progressively more abstract, until you could not even tell what they were supposed to be. Then, my students created their own trees using Elmer's glue on black paper. The students had to decide if they wanted an abstract tree or a realistic tree. They colored in the background area around their trees with pastels, using analogous colors. I have seen a lot of projects with glue and pastels on art education blogs and art lesson plan websites, but the glue we had did not dry as clear as I'd expected. Some of the students' trees have large white spots where the glue was thick. Nonetheless, they had fun using glue in a different way!