The next best thing to sleeping among the trees is a bedroom turned into a forest. I love (and covet) the "Apple Tree Canopy Bed," above, by Attiladesign in Finland -- as well as the magical two beds below: "Tree.
Apple Unit from Kindergarten Hoppenings / Great when teaching seasons. Could use balls of tissue paper for each season, and have each student glue one piece onto each tree. so the whole class makes ones poster together