I've done a project in the past with HS students but I'm sure it could be
ada[ted to grade schoolers. Louise Nevelson has been my motivational source
but any found object artist could work. I collect boxes that the pop cans
come in. The PE dept in my school fills the machines (and gets the profit).
They will save them up for me. If you wanted to work smaller I think that
shoe boxes or dress shirt boxes would work too. Be sure you have several
types of glue for the kids to use or else limit them to things that Elmer's
or whatever you're using will hold. I had the biggest problem getting plastic
stuff to stick even with a glue gun. When everything was finished and dried,
I took them outside on a dry, non-breezy day and spray-painted them one of
2-4 colors. If you want to limit them even more, make them chosse between
black and white. It unifies the whole project. The students always thought
that their projects were a lot "cooler" once they were painted. Good Luck.