An interior on-going ecoartwork

So...over the past 3 years, I have been working with Moultonborough Elementary School's teachers and students on a painted mural project. The concept is to have students work together to illustrate what they learn about Moultonborough's natural landscape each year, while also addressing art curriculum areas. The students meet with me to brainstorm and plan their design, and we lay out the panel. Each year, the students add ingredients onto their panel, so that by their final (6th grade) year at MCS, their panel combines many ideas and details about the trees, animals, landforms, etc that make their local landscape unique.
Though the concepts for each grade can change if teachers want to explore different ideas in subsequent years, the plan currently looks like this:

Kindergarten and "Readiness": The life cycle of trees- identifying and drawing different trees that grow in the area, and what they look like from seed to sapling to mature tree and beyond.
First Grade: Insects- describing the parts of an insect, depicting several insects that live here, and applying the primary and secondary colors they are learning about in art class.
Second Grade: Clouds- this is a great link to a classroom unit that explores cirrus, cumulus, and stratus cloud forms, while also practicing mixing warm and cool colors.
Third Grade: Animal Habitats- this dovetails with the annual unit on endangered species, where students learn about what animals need to survive. We brainstorm what animals live locally and what their needs are, then selecting a few, students illustrate the animal and its habitat, placing it in the appropriate physical location on the panel.
Fourth Grade: Tracks and Trails- As 4th graders take field trips to specific local trails and terrains, this plan connects to their physical experience and to mapping skills.
Fifth Grade: The Earliest Settlers in Moultonborough- this plan has students applying what they've learned during their Plymouth Plantation study to what might have happened when the settlers arrived in Moultonborough. We think about the human habitat and how that fits in with the natural landscape.
Sixth Grade: Moultonborough Messages- In this culminating year, we ask the students to think about the various activities that people can enjoy in Moultonborough's landscape. The students work on ways to describe the possibilities with few words.