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EGG CARTON MAGIC (1970) contains "Ideas for over 30 egg carton novelties" that include things like an egg carton owl and an egg carton shape.
YOU CAN MAKE EGG CARTON FLOWERS (1971) contains instructions for making a variety of blooms out of egg cartons.
Both booklets published by Craft Course Publishers. It looks like all projects are geared around using styrofoam egg cartons.
Booklets are in excellent condition.