This idea began as a quick something for the early finishers...and then they began to protest. They all want to work on them and they want to spend class time. 3rd and 4th grade. I may have to indulge. I'm a little partial to them as well.
To start I let the students use my "Draw Insects" book by Doug DuBosque. They also used a zentangle/doodle book that I inherited from the previous art teacher to add a border. I've rewritten the lesson plan to include instruction on positive and negative space as well as symmetry, which will be how I present it at school #2 on Monday. Full lesson plans, clip art and worksheet available on TpT.