I have to work up to this idea through a unit on fantasy, incorporating
dreams. I read fantastical books, show Chagall and Dali. Ask the classroom
teacher if she does this. You can do it if she doesn't.
I call it dream painting (not terribly accurate except in some cases) and
it seems to get the idea across.
Try having them do a collage of a few pieces then gluing them on a
background of sky with clouds.
Or, try having them divide (by folding) a sheet of paper into 4 or 5
unequal sections each to be worked separately but needing a unifying idea.
With Miro's "Composition" I had them do black-line scribbles and color them
in creatively. *After* the production aspect I showed them the Miro, to
much appreciation of his and their own work.
Anyway, just a couple of tid-bits. (g)