A quick idea for something "significant, yet temporary." Occasionally I will
have a class make a Pollack style mural (12' long or so). Then we hang it up
in the hall with a written narrative of the process and what it's all about.
After a week or so I have another class rip a piece of the mural off (a part
they like) and use it to print their linoleum block on, or to use as a book
cover, or as the background for a portrait, or as part of a collage, etc.
Once I used the mural as a place for students in the school to write; I
wrote a question on a poster over the mural and requested school appropriate
responses. After the mural was filled with responses I then asked students to
take a part they liked to use in their art.
The original class understood that its work would be transformed by others
after a while.