Jungle/Giraffe classroom door. Giraffe's spots are children's pics printed on yellow paper in sepia tone. Monkey is a Dollar Tree paper plate with construction paper arms added to hold sign saying, Look Who Was "SPOTTED" in the Jungle.
Tree idea for Reading Area, tent... Options: attach some of the branches to the ceiling /or drape thin blue cloth for sky/night sky. Add white Christmas lights to the "sky" i.e. on the hanging fabric or wall ceiling.